If your tired of frets on fire's look and feel, and you want to up the guitar hero experience, i suggest you download FoFix (
http://fretsonfire.wikidot.com/fofix ). Its the upgraded version of fof, that has many new features to make it feel like guitar hero or rockband. (Multiplayer mode, Star power, killswitch (whammy), and themes to complete the guitar hero / rock band feel, or whatever other feel you want. (Mario, Microsoft Paint, etc.)) The rest of this instructable is done using Fofix, but its fairly easy to figure the rest out on your own if you don't want it. Here is a link for themes.
http://www.fretsonfire.net/forums/viewtopic.php?f=11&t=24976