No, sorry. custom boxes only utilize dA's CSS. =CypherVisor has dug up and compiled many of the codes which can be used in the widgets. Perhaps ask him if he knows of any that are thumb specific to make them styled differently. Mine can be used in journals, and perhaps even apply to gallery... It would need a bit of editing, I think.
Yeah, I'm very much not used to people faving journal posts. And it doesn't have anything distinguishing the difference in the notices. It really should have "Yada title": Journal. Though for skinners, it may still be confusing. I'll just have to adapt and name my journal posts something different than the name of the skin itself.
I saw the ei and wondered at the meaning. Then I read the description! (I know, who does that?) I think I need to put Read Description on the preview image or something, since I'd say a good 80% of the help questions asked are usually answered in the description.... lols.