Barbara uses ugly duckling prints and overdyes them with 1 drop of Fabric Magic, 1 drop of Colorant, mixed with 1/4 to 1/2 cup of water.
I wrote a tutorial and share it here with her permission. My version begins with rust-dyed fabric that needed a little something more. Click the link in the column on the left for a download-able pdf file with photos, step-by-step instructions, and a link to Earth Safe Finishes for lots more information and a chart of all 22 Colorant colors.
Using the right colors, you could create beautiful faux marble, granite, malachite, and scads more! I just love the texture and want to print a texture or background photo on top, once we've established the proper parameters of pre-treating fabric with the Fabric Magic mix!