It varies. It can be graphics. There's also been scavenger hunts for screencaps in the shows and making fanmixes and scattergories and word seaches and crossword puzzles. It totally varies. Plus you don't have to do them all. Even if you did do one, the entries are usually anonymous unless you win the vote for best one!
It really is fun! It's nice competing with a bunch of fans of your favorite shows!