I think the current TweakVista appearance is rather nice. It's a pretty clean skin, and looks well thought out. But it
does look different from the rest of my desktop, so it takes away from the overall effect that WB is intended to create.
It would be nice to have an option (like a checkbox or similar) to choose the default skin or to conform to the current WB theme.
It just strikes me as kind of odd that a company that makes applications to change the look and feel of Windows also makes an application whose appearance can't be changed

Granted, TweakVista isn't something I'm going to have up all of the time, or even that often, so it's less of an issue than it might be.