A thready only has one layer of fabric which is then covered. It's an embroidery (I guess), not a quilt.
Now here's a crusty I made ages ago in 2002. It was the third or fourth one I made. This is Danger. It measures 11" x 12" at its widest points.It's a typical crusty [the technique is based on the methods of Susan Shie - there's a link in the sidebar] which consists of a backing fabric, batting and a top fabric (a real quilt sandwich) which is first bound, then appliqued, stitched and embellished. Lots of encrustation = crusty.
Here's a closeup. You can see the holes I cut through all three layers, used floss stitches to "bind" the three layers again, and then added a Halloween spider web organza behind them. I added plastic spiders as well and that's a glow-in-the-dark ant caught in the web.
The terms threadies and crusties are mine (as is beadies). 3 Jacks was a true mutant creation in that it was threaded like crazy, but onto a crusty quilt sandwich, and then embellished. More of a threcrusty. Cruthready? Neither term sounds attractive.
I make threadies differently every time I do them. So the only "rules" as far as I'm concerned is that it has a fabric base and is covered with lots and lots of thread. There can even be some snippets of fabric too.
On a danger theme, I just had to include these Parisian photos from the rail station:
I have really been struggling with the overcast weather. It rained a bunch yesterday and I even went out for a bit anyway, but then we were lucky enough to have an hour of sun.
And now some links: