Since making a automated farm is impossible, and making a semi-automatic farm very difficult in the latest versions (sheep eating grass is not a block update any more) stop talking about it. The question was of aesthetic nature. To make a farm you need 16 pens for every kind of sheep and you must make the floor out of grass. Make the entrance a giant sheep head and use the appropriate wool colors to mark the different sheep pens. Use hardened clay of some color for decoration.
Make a new one in 1.7, and try to have a new set of goals when making a new world. If you don't then every world will come down to beat the Wither, beat the Dragon and so on. If you make your goals different it will make your game more versatile and you won't get bored that quick.
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