This is one example of abstract art that you can make with a little kitchen wizardry and some hot air. This craft comes from Family Fun Magazine of February 2004.

Materials: Bubble Solution.
Straws
Low edged dishes, like pie plates
Newspaper to reduce clean up
Plain printer paper, or construction paper
Liquid tempra paint in several colors

Time: Prep time 20 minutes. Craft time 5-25 minutes.
Method: 1) Make Bubble Solution
Bubble Solution Recipe:
3 cups water
1 cup dish soap
1/4 cup corn syrup
Mix thoroughly.
2) Blend 1 cup of solution with 1/2 cup tempra paint.
3) Pour about an inch of solution into each of the pie pans.
4) Use the straws to blow a mountain of bubbles almost ready to roll off the edge of the pan.
5) Press the paper gently into the bubbles to burst them.
6) Lift the paper and see what you have done and where you'd like more bubbles.
7) Repeat. The layering of bubbles gives your art color and depth.

Tips for Working With Kids
They will try to make this into a contest: Who can blow the most/biggest bubbles. It is actually the smaller bubbles that make the prettiest picture.
Provide about 6 sheets of paper per child. Perhaps more. They will want to make a lot of these sheets.
If you do this in multiple colors, encourage the children to try layering blue over yellow or another combination.