When I decided to try some marbling, I purchased some Dye-na-Flow paints to try. I wondered what else I might do with those paints and found this tutorial on sun printing with Dye-na-Flow on Lynda's "Boom Bake & Create" blog.
If your weather has been like ours lately, a sunny day will be hit or miss. I'm sure, though, we will be seeing more sunny days in the near future. If you give this a try, let me know. I'll post a link to your blog.