This definitely might not be used for the next CYS minecraft world.
Pencil and paper, MS Paint, ASCII art, whatever you're comfortable using go ahead and scribble, eat it, throw it up, eat the throw up, shit it out, upload your vomitpoop to imgur, and link it here for all to enjoy and maybe use.
Example I did in less time than it took to write this post:
Doesn't have to be original - you can eat someone elses shitvomit and add to it, refine it, polish it into even better turdsauce. If you have 0 creativity because you used it all up on a contest you can just endorse an idea by saying "delicious, finally some good fucking poopybarf" (or similar sentiment) in reply to others.