First off, I don’t know why I didn’t know about this site before, but let me say, Curbly is awesome (hip and cool DIY, I’m so in!).
While I’ve been perusing the archives, I came across these inkblot pillows (from Uniform Natural). The geek in me instantly lit up and though I don’t think you could make them by actually folding over the fabric, I don’t think it would be too hard just to paint such a design by hand. I think I’ll consider that the next time I’m thinking of getting some pillows.