I've just recently installed Linux (Elementary OS Luna) over my Windows and im incredible impressed it's so much faster, smoother and more comfotable to use, i'm really happy i went with this! it looks so awesome.
I'm currently using
Window theme - Elementary
Interface theme - Elementary Lion
Icons - Hycons (My mod)
Cursor theme - Mac-Cursors
Watching Pineapple express of Stock video app called - Movie Player.
Hopefully I figure out how to customise this OS a bit more soon, would like to change the taskbar to have the finder bar like in ubuntu