I recently got an R4 and went looking for the theme I had in my head. It wasn't there, so I pieced this together from a few others. The icons and color scheme are ripped from a Sonic theme by TakaMaru.
Download it here:
http://headclot.googlepages.com/newsmb.zip
Download it here:
http://headclot.googlepages.com/newsmb.zip