Suggestions as to Which Flavor of Linux to Use

I have a brand new Toshiba Satellite L655-S5150 laptop. This is a 64-bit, dual-processor currently with Windows 7 installed. The thing that I miss the most from Windows ME was the ability to create desktop themes. So I would really like to find a version of Linux that would do the same type of thing, but this is not a priority. What I really do not like about Windows 7 is the 'Windows for Dummies' approach that Microsoft has used. I am the only one on the computer which makes me the Administrator by default, but I do not have access to the Documents and Settings folder. I want at least as much control over my system as I have with XP (with using Tweak UI). I like the Toshiba Bulletin Board and the other Toshiba utilities that came with the laptop, and am hoping Toshiba has versions for Linux operating systems. But I would be able to survive without them. I am open for recommendations.

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