One of the things I use for paper piecing is sandwich paper. It is non-waxed, semi-transparent, and is cut to a 12" square. Restaurants use it to line baskets for french fries. Very inexpensive and you get LOTS (1000) of paper. I get mine at the local restaurant supply store. All the little tiny bits of paper that stick to the corners of seams will wash out/dissolve, so I don't have to worry about getting every last little bit of paper removed.