As far as I know, you can only get sunart paper that turns blue (please comment below if you know if it comes in other colors) but blue worked perfect for this layout. I like it next to the bright contrasting yellow.
For my first few prints I used cilantro, a small tree branch and some buttons. This is what it looked like before I placed it in the sun:
Have you ever used SunArt Paper? They also make a solution you can apply to fabric and get the same effect.