Yes, I'm rather fond of the "Walnut" Firefox theme, but I don't want to use it everywhere. I use it on my laptop, along with a GTK Theme called "CedarBrass", which is highly modified from a GTK Theme called "HandCraftedFromCedar". It seems like wood-look themes are the only exception to the rule, being interesting, tasteful, and readable.
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http://too.katspace.org/gallery/scrapbook/2010-03-24-113946_1280x800_scrot.png is a screenshot, showing both "Walnut" and "CedarBrass" themes.