In fact, there have been a few. Varieties include monsters that look and act like trees until attacked and monsters that simply live in and around them.
Let's say your walking around, being all chill' and being a general gangsta in the Mine craftin world.
THEN ALL OF A SUDDEN YOU SEE THE MASSIVE LAND MASS THAT HAS YOUR NAME AND DREAMS WRITTEN AAAAAAAALLLLLLLL OVER IT!
So you climb this wonderful piece of land, notice a few weird things, but over all is just stoked to be alive for this glorious wonderful moment in your minecraftin' life!
SO YOU GET TO THE TOP AND AS YOU DIG INTO THAT LITTLE PIECE OF VIRGIN LAND... THEN IT MOVES!!!
In fact move is an understatement... IT SHOCKS YOU UP INTO THE AIR! Then you hear it... YOU HEARS IT'S MOAN AND REALIZE YOUR GRAVE MISTAKE... "THE LAND ISN'T LAND... IT'S A GAIA DAUGHTER" SO NOW, IT'S STARTS MOVIN'.
Since it's movin' it disconnects from the land and turns into a MOVING FLOATING ISLAND THAT YOU CAN NEVER HOPE TO ESCAPE FROM!!!
Unless... you find it's heart and completely destroy it.
Though gaia isn't just some ***** who'll lie down for ANY SEXY SQUID AS YOU RIP OUT HER HEART, SHE HAS HELP.
Specifically, "WHITE BLOOD CELLS... JUMBO SIZED TO THE MAX" They only appear inside of her though so if you need to escape a cave... well... no you can't escape cause her body will slowly heal any gaps you created.
Now if you get lucky enough and survive, once the heart is destroyed the white blood cell's will die, THEN YOU GET A FLOATING ISLAND FIT FOR A KING. THAT'S RIGHT YOU HEARD ME, A FLOATING ISLAND.
Cause since she's dead her body isn't moving anymore though it's still in the air!
So basically THE BEST IDEA EVER has THE BEST REWARD EVER AND CAN BE COMPLETED WITH FRIENDS AND GROUPS.
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<- This is clickable by the way.... CLICK IT. SQUIDS DEMAND YOU DO SO.
"You know Squids are totally going to rule the world once they develop Battle armor for the land"
The ability to pick up creepers and use them as bombs.
If a man walks in with a bandoleer full of creepers, you know he means business.
You also know he is about to explode, s o you should probably keep your distance.
Working, craftable instruments which can be played with your keyboard like in Frets of Fire!!! (The freeware Guitar Hero ripoff where you "play" the keyboard by holding it like a guitar, and press the 1-4 keys)
Then I could be Fansy the Famous Bard!
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This may be a fad, but I love dragons, so why the heck not?
Let's make it so we can ride mobs! ALL OF THEM! Pigs, chickens, creepers, ALL OF 'EM!!! It doesn't matter how suicidal, insane, impossible, non-functional or silly it may be! I want to charge into combat atop my trusted skeleton!
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This may be a fad, but I love dragons, so why the heck not?
How about that one type of enemy mob commits cannibalism on others of its type? Imagine creepers - they can explode. What if two creepers "combine", therefore increasing the time both that it takes to SSSS and explode on you, as well as the radius?
Edit - Don't forget special mobs who behave like zombies, but possess more health. When killed, they have a chance to drop a random piece of armor, or weapon.
... wait are you being serious?
Was their a killer tree idea? If so then... I only see doom and despair down that road.
"You know Squids are totally going to rule the world once they develop Battle armor for the land"
MASS LAND MONSTERS!!
Let's say your walking around, being all chill' and being a general gangsta in the Mine craftin world.
THEN ALL OF A SUDDEN YOU SEE THE MASSIVE LAND MASS THAT HAS YOUR NAME AND DREAMS WRITTEN AAAAAAAALLLLLLLL OVER IT!
So you climb this wonderful piece of land, notice a few weird things, but over all is just stoked to be alive for this glorious wonderful moment in your minecraftin' life!
SO YOU GET TO THE TOP AND AS YOU DIG INTO THAT LITTLE PIECE OF VIRGIN LAND... THEN IT MOVES!!!
In fact move is an understatement... IT SHOCKS YOU UP INTO THE AIR! Then you hear it... YOU HEARS IT'S MOAN AND REALIZE YOUR GRAVE MISTAKE... "THE LAND ISN'T LAND... IT'S A GAIA DAUGHTER" SO NOW, IT'S STARTS MOVIN'.
Since it's movin' it disconnects from the land and turns into a MOVING FLOATING ISLAND THAT YOU CAN NEVER HOPE TO ESCAPE FROM!!!
Unless... you find it's heart and completely destroy it.
Though gaia isn't just some ***** who'll lie down for ANY SEXY SQUID AS YOU RIP OUT HER HEART, SHE HAS HELP.
Specifically, "WHITE BLOOD CELLS... JUMBO SIZED TO THE MAX" They only appear inside of her though so if you need to escape a cave... well... no you can't escape cause her body will slowly heal any gaps you created.
Now if you get lucky enough and survive, once the heart is destroyed the white blood cell's will die, THEN YOU GET A FLOATING ISLAND FIT FOR A KING. THAT'S RIGHT YOU HEARD ME, A FLOATING ISLAND.
Cause since she's dead her body isn't moving anymore though it's still in the air!
So basically THE BEST IDEA EVER has THE BEST REWARD EVER AND CAN BE COMPLETED WITH FRIENDS AND GROUPS.
"You know Squids are totally going to rule the world once they develop Battle armor for the land"
This would go great with my gun/flame thrower/dragon/bling idea.
Walking tree
in the bottom of caves satin is down there and if he kills you (he has 1 hit kills)
you become a demon
forever
If a man walks in with a bandoleer full of creepers, you know he means business.
You also know he is about to explode, s o you should probably keep your distance.
Then I could be Fansy the Famous Bard!
Let's make it so we can ride mobs! ALL OF THEM! Pigs, chickens, creepers, ALL OF 'EM!!! It doesn't matter how suicidal, insane, impossible, non-functional or silly it may be! I want to charge into combat atop my trusted skeleton!
Ssssss....
*BOOM*
If you get near them they suck you in and they destroy everything near them.
They are also very silent and hard to see.
"You know Squids are totally going to rule the world once they develop Battle armor for the land"
how about portals that spawn a skeleton-creeper-pig-zombie-spider-sheeps
Speaking of that:
TNT armor!
Edit - Don't forget special mobs who behave like zombies, but possess more health. When killed, they have a chance to drop a random piece of armor, or weapon.