I'd love to see all you care to post. Those are beautiful!

There are also a lot of examples in our gallery:

strings 1

strings 2

Could you use a cotton batiste fabric for a foundation? I've been saving strings for quite some time. I have a bunch of batiste (or "lawn") that has seemed too thin to use as a backing. I have a couple of old telephone books, too. However, the thought of ripping all that paper off sounds daunting.

Here's a picture of a string quilt I want to make. It's on her home page
bkay
great string quilt

Whatever fabric you use will add weight. I've made several with used dryer sheets and they worked well. (Some folks say to be leery of dryer sheets if you are worried about allergies to the perfumes, but I launder them first and they haven't caused a problem for me.)

It's not at all difficult to remove paper, if you sew your pieces with a very short stitch.

The quilt in my avatar is made of tiny strings, 1/2" or so. Lots of selvages. I am working on one now with 1" and up strings. My days of teeny-tiny are in the past. I always do foundation piecing on cheap fabric.