Paper piecing paper... :-)

[QuiltinKay]

I have done a lot of paper piecing and I use newsprint. I sometimes go to the newspaper and they will sell or give you roll ends of newsprint. Or you buy it in pads at WalMart or some such store.
I do a lot of string piecing on various shapes or sizes and this works very well for me.
When I am string piecing I draw the block on paper, piece over it and then trim to size. I found that if you draw with a marker you can still see the shape from the wrong side when ready to trim.

QuiltinKay or Mama Kay

[knitnoid]

It depends on what I'm piecing. For string piecing, I've got an old phone book I'm using. If I need precice points, I like to use velumn so I can see though it.