1st - Very nice colours, a bit minimalist though
2nd - Bright, but the banner and the globe icon look very good
3rd - Nice look, however the dark grey on dark blue isn't good, maybe a lighter shade of blue would work well
4th - Very windows XP, fresh and funky good use of colours and well layed out. I'd go with this one personally
The first one is the best for me.
Nice colors, clean design and graphics, pretty!!
My choice is for Nº1.
The second one looks pretty too.
Same as first, but I liked more the one in which all your content fit with screen. Second is a little bigger than screen.