Joann's also carries laminated wire in red, black, purple... usually in the bead section. It's just straight wire, but you would double it over and twist it. It's fairly thin, so it could work well for this.
This is awesome! I totally want to do this with poster art for myself, and with things like dragonflies and turtles and flowers and absolute pictures for the different suites for my friend. AWESOME IDEA!!!!