My sister just bought that book a little while ago. I don't think i've seen her wear a normal t-shirt in years. She's always cutting them up and modifying them.
I'd never actually heard of it before until reading about it on this forum. I ended up buying on ebay. I just got it the other day and my friends and i decided it would be fun to host a "t-shirt party" where everyone brings their old t-shirts and we modify them while drinking wine and eating chocolate.