I'm also working on making the background a little bit more exciting. The green cuff I did sort of a spiral look using the same bright green color but one is transparent and one is opaque. I really love this look.
The second guitar is super bright. I'm using a bright yellow and a deeper yellow for the background and then a bright blue for the guitar. I'm really in love with this one.
I have one more guitar shape that I'm working on and then I have a few more ideas for future guitar cuffs. I'll get some pictures of those up as soon as I finish beading them.