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I've recently tried Mint Linux, and it's very aesthetically pleasing (screenshot http://i.imgur.com/2OBiH.png). (Disclaimer: Mac user)

Edit: except for the tray icons.

One of the main reasons why that screenshot looks good is due to the fonts you're using, which are good fonts (presumably from MS Windows).

Good fonts always make a massive difference in terms of screenshots.

I agree, fonts (and their aliasing) make a big difference. But the UI font is the standard DejaVu Sans. (Only Google's page is in Arial.)

That is almost exactly the Dust theme which is now default in ubuntu, with green icons instead of orange.

That "almost" is where the big difference is. I think this theme is more balanced and pleasing.