Do some exercises. Yoga-esque stuff you can do on the floor.
Pick up pen and paper and be creative. Write a story, sketch out ideas, draw something..
Play a musical instrument. Sing if you haven't got an instrument. Or whistle.
Meditate. Read fiction. Read something to make you more knowledgeable.
Do chores. Prepare something nice to eat.
Have conversations with yourself, using different voices.