you could be easy, like what I did [until someone yelled at me] and go to My Mibba, then under Profile there's CSS and in that there should be a link to find premade layouts.
But if you want more... unique layouts you can go to Google and type in "Mibba layouts" or something of the sort, and find different people who make them =] like Owl Sexual and Lame Face are probably some of the most popular. Mine is from Lies for a Liar
My day was alright, then got lost in Atlanta/Marietta on the way to a concert. Then had an amazing time at the concert, lost my voice from screaming, took a few shots of vodka, anddddd now I'm laying on a couch, lookin' at the ceiling haha