I need creative ideas for painting my room!?

My parents are letting me sketch out whatever I like on my walls and paint it myself. I don't want to paint the walls a whole colour, I want to paint funky things on the walls. Things like a purple giraffe, multi-colored stars, bleeding clouds, and just odd things that would add some color to my room and make people be like "Wow, this room is crazy awesome!".. any ideas of random things i could paint?thanks a bunch!