I've made a randomizer that picks 5 random tags from e621 so that you guys can use it as an art challenge/prompt. It has some settings so you can choose whether you want to see more common or rarer tags, and also to pick a species tag.
I did it purely for fun and to see what kind of weird shit it would actually spew but if you only pick from the uhhh, say, 4000 most popular tags, you can pretty much use this as drawing prompt lol