I try to look around me and take challenges from other art teachers.
Here is my latest challenge:
Draw a dancing lobster!
I drew this one digitally but you can draw or create from found objects.
Try some of these ideas from my favorite list:
Draw a dinosaur driving a car...
Draw a shark water skiing...
Draw a llama surfing...
Draw a crab at a birthday party...
Draw a cat playing a sport...
Draw a butterfly eating lunch...
Draw a shark eating a cupcake...
Draw a chicken skydiving...
Draw something that YOU think is funny....