No, they are not paper pieced. They mostly work with 1", 1.25", 1.5", 2", and 2.5" pieces.
I'm going to plug a product here, because I have owned it since 2004 and would never go without it. It's the TRIANGULATIONS CD. I just got a new laptop and purchased a CD reader to go with it just to use for this CD. All you do is pop the CD in, pick what size FINISHED HST's you want to make, and the paper prints out on your printer. I know you can purchase papers for triangles from other places, but this CD has 1/2"-3" finished sizes in increments of 1/8", so any size I have ever wanted to use (that is small) can be printed out from this CD. I have used this to make all those itty bitty HST's that finish at 1/2" and 3/4" and up.
Thanks,
Suzanne in VT