DD1 is turning 4 in two weeks and on that same week at preschool the theme is art in all it's different mediums.

I thought it would be fun to put together a bag of art supplies as a gift for the class for her birthday.
I'm buying construction paper, crayons, markers, watercolor paint. I want to keep it around $25.

Any other ideas, particularly "out of the box" ideas like saving household items? I work in a architecture firm so I already save things like letter sized paper and large format paper for them.

Thanks!