You're a bit of a newbie designer, right? At least when it comes to webs, that is? However, great work! The link buttons are a little dull and boring, but that's easy to fix. However, if you just use som php or some other programming code, you can have a function where the page visitior can decide wich layout to use on his own. Well, you have to be using css for that to work, and for the settings to stay set for each individual person you will have to create a cookie on that person's computor. It's pretty easy, and if you're using css (in an external file, please) I could help you fix that function.
However, if so, don't use the second one as it's pretty ugly when the blue hits the green in that way - there should be something more between to make it look better... Anyway, the first and the third (and if you create one or two more like a red and/or a yellow) would be great with suh a function as they look just the same, with only the differ of colouring.