Michelle, the art teacher next to me at the museum, did the coolest project!  Oh my!  Did you know there is sun paint?  Just like the sun print paper!  What you will need:  muslin fabric cut to size, the cool sun print fabric paints (click here for source), cut-outs and found objects to put down for printing. Here is what she did:

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!