Hey all, this is John, the owner behind Monolith. I bought a sandpaper systainer from Tom (thanks for the mention Tom).
I honestly think it's awesome when people make stuff like this themselves. In fact, this whole side venture started when I wanted a wood back for my iPhone 4 but the only two offerings I could fine were nearly $100! I made a few for friends and myself and realized they were inexpensive enough to make and kept going. Having said that, I think a lot of people just don't have the time or skill (what little is required) or equipment.
For those who want to make their own stick-on veneers, I would suggest using paper backed veneer. The non-backed veneer tended to splinter pretty badly when trying to remove it (it only took one set of bloody fingernails to figure this out), at least with the adhesive I use. As far as adhesive, 3M makes some good double sided tape that will stick to the high surface energy glass. It's a special order item in thicker widths but you can probably get some 1" wide sample rolls from RS Hughes or a 3M rep which would be enough to make a few.
I've been meaning to join the forum for a while now that I have a good reason to start a Festool collection.