Step One: Tape down a piece of muslin fabric. Spray it with water to dampen.
Step Two: Paint the fabric with the sun paint. Then lay down the objects and paper cut-outs you will like to have a sun print made of!
Step Three: Weigh down the objects with rocks and weights. Michelle says this will give you a better sun print with more details. Put in sun (read your paint's instruction for time).
Remove objects and Ta da!