How about a mod where there's a block right ? and when powered by red-stone , it pushes the adjacent block away by 1 block ...
or a tamable pet ? hmm that might be good .
WHAT ABOUT A GUARDIAN FOR THE VILLAGERS ?!
I know... HOW ABOUT AN UP-TO DATE NETHER EXPANSION MOD! You must make this for all the cool guys that want to live in the Nether. Make ghasts more rare, add an option to start in the Nether dimension, a new evil purple pet: Mauls!