I'm not a collector, but I have run into a type
that
you might not have seen... oriental rug mousepads.
There's the Mouse Rug, but that's a fake -- just an
oriental pattern printed on a plain old mousepad.
But there are also woven rug type pads, which are
far nicer.
I got mine from
oldcarpet.com.
Yup - got me one too. Still using it at this moment. I picked it up at a
Las Vegas Comdex convention some 7-8 years ago.
The main reason I purchased it was the fact that it claimed to
automatically clean your mouse. In fact, printed on the backside of it is:
"Automatically Cleans Your Mouse"
I don't remember ever having to clean my mouse since. (And yes - I still
use a mechanical mouse with said mouse ball. Haven't gone optical yet.)