For textures:
SharedMedia: Renaitre --- there is actually a texture in here called "gloss" that you could use.
Ferous Media Pack
The files should show up if they are in the right format & you made the layout correctly. You could try and use the texture that looks like it has gloss or actually add a "gloss" texture as a second frame on top of the main one. That is generally how people get glossy looking textures on different elements without hiding to much of the panel/button/whatever behind them
I'm looking for an interface with a glossy look to it. Don't you know you cant find one when you go looking
Found
caelUI, which is the main one I was thinking of, since it does gloss very well without being overwhelming.