Very nice. I like all your themes, because they are congrous, there's clearly an idea behind them. What I also like about them very much is that you change the colours on the new tab screen as well: as far as I'm concerned, there's little point in having a colour-themed firefox if you're still going to be assaulted by that wall of relentless white every time you want to start browsing for something new. I particularly like it when the colours on the new tab screen somehow match those on the window bar and the rest of the theme, but that doesn't always need to be the case.