Just go to google and type in "free myspace layouts" and almost all of them work. I know for fact 1 makes you download. So don't pick that one, unless you want to. Oh and i'm supposed to tell people to add 13killer1 on myspace.
-Hope this helped, if not, let me know
98% of them are free. I do what MrsPretty said, but I would type in "custom myspace layouts" b/c if you type in "free layouts" it's going to give you pre-made layouts as well vs. only sites that let you create your own