http://www.mibba.com/forums/topic/33742/
Ok there are literally HUNDREDS so I'd recommend starting at the end (page 112 and working backwards that way as the best ones tend to be the more recent ones - hope you find what you're looking for :D)
Ok, for layouts...do you know how to work CCS or HTML? Because if you don't there are many forums on mibba that I can link you to where people put layouts they have designed, and you can copy and paste them to use :)