Sometimes, I find plain bangles from the Dollar Store. While they are cute as they are, I usually itch for a blah to TADA! make-over.
Here are some pegs on how to give them a face lift:
(1), (2), (3) Graphic Elements - use a permanent marker to draw some artwork or fancy them up with alphabet/numeral stickers.
(4) Neon Lace - cover the bangle with lace for texture and dimension. Create a lace "body suit"; slip it on the bangle and stitch ends to close.
(5) Decoupaged Design - glue on some paper cut-outs to the face of a bangle and coat with several layers of Mod Podge. Allow to dry before use.