I don't know if it would work for PP, but I recently used tracing paper for a design to stitch on a quilt. I sprayed a piece of printer paper lightly with 505 and carefully placed the tracing paper on it. I was able to run it through the laser printer to get my design.
I did this because I wanted to stitch through the paper onto the quilt edge. It is just a small candlemat that I wanted to put a few hearts along each edge.
Considering that I can do this and tear it off easily, perhaps you can use it for paper piecing? Just a thought.

uote=inemmausinn]I'm about to start a huge paper piecing project and have been doing some research. Vellum is a great tool. So were do I get it. Scrapbooking uses thick vellum and I need thin. Do I go to the quilt store, craft store or office supply?[/quote]

I get mine at Joann's or Silver Linings.

any paper supply business has it, I buy it for card making and paper projects. It comes in a tablet, so you just tear off a sheet. I believe I got mine at Office depot.

I'm new to the quilting community, but I just purchased online a product called Quilt & Tear on a Roll (12" x 60 ft roll). It's for machine quilting, sewing and crafts. I used it with a light box to trace my pattern. Here's the link: http://www.softexpressions.com/softw.../QuiltTear.php

If you have a Hobby Lobby, you could get some there.

I do a lot of pp and I use my copy paper. It works great and tears off easily.

On another thread recently, someone was using an old phone book. Surprisingly, it worked really well - the lines were very easy to see on the page. You might try that first, and if it doesn't work, go to dickblick.com. They have reams of newsprint paper that is excellent - only about $4.00 a ream.

Years ago I purchased a package of 500 sheets of Onion Skin paper, I think it was about $25.00. I still have half of it left, but you can see through it easily and it tears nicely. I will probably bite the bullet and buy another package when I need it. Just Google Onion Skin Paper and you should get the website.
Michelle G. in El Paso

I use my own printer paper as well...something that helps if you have trouble pulling the pieces off is either folding along the lines before you begin sewing, or running it through the sewing machine without any thread to perforate the lines so they tear off easier. But in my experience, if you're dropping your stitch down to 18 stiches or so per inch, those teensy stitches will do the job on their own and make the paper pretty easy to tear off.

Art supply stores!