So I was thinking the other day that the nether star really only has one use, to craft a beacon. So I came up with another possible use for them, wands! A wand would be crafted with a nether star and two sticks. It would have a very high durability since Nether stars are hard to obtain.
Once crafted the wand could be used by holding the wand in your regular hand and any potion on the offhand slot. When you use the wand, it would fire the potion effect. The potion effect travels in a straight line, piercing up to 3 mobs or players. The wand would also allow the potion to be fired 3-5 times before running out.
But anyways, that is my idea! Let me know what you think of it in the comments!