Tags are probably one of the best examples of something to make that can give you immediate gratification. They're tiny collages made up of whatever you've got to use, and best of all I think the more layers- the better the tag!
I have such a fascination with these types of images- cute little girls all in a row, smiling those angelic smiles that you just know are covering up all the mischief they got into already that same day at school.
Sure makes me miss elementary school! How about you?