On XP, why aren't the logoff dialogs using per-pixel? Like on Cosmos, the XP preview has totally square logoff, but the skin actually has per-pixel dialog.
The WB OEM version for XP is not 6.1 (which I am assuming you also have installed) for mass compatibility. So, if you have WB installed in addition to MyColors, you will see per-pixel in use.
I've seen 3 (all ones made by Lasse) with them skinned so I'm guessing they CAN be, but the rest are not showing them skinned.
Just like the Premium Suites, not every skin author creates identical content. Some authors see some of the Windows icons as needed to be changed, and others think it's more usable leaving them as is. They all change live folders and the most commonly used icons.
As for Glass, it *can* be used. However, that doesn't mean that all skins will use it. AS an example, Diamond (which is free) uses glass. You could always try it out for free to see what MyColors is like