Right on, just some quick ones a little more geared towards what you described..
similar to your pic
one I'd like
raw version of the green marble
note:The grey is pretty standard for most bars, and addons where these statusbars are used by SharedMedia will color them properly according to your settings, so pretty much the tga versions are ready to be put into your bar libraries without any further alterations.
(these bars are 256x64.. the most popular size is 256x32)
let me know if I'm on the right track..