Sweet Paul's dyed sheets, and I love this DIY as well!
Studio Choo over at Design*Sponge lined out a DIY to turn biodegradable paper cups (albeit, not shabby looking to begin with) and dip dying them into home made dyes made of organic material to give them these beautiful pink and purple hues. I love the watercolor look, the gradation of color, and the fact that they're made from natural pigments!
This seems like it could be an amazing project for a wedding, for experimenting with finding new colors, and even to do with kids! I've definitely got this one bookmarked!