Well, I promise it CAN be done. I'm in the process of creating Chibi-usa's wig. First step is to find a short-haired wig with bangs, it that colour.
Maybe this one? http://awesomewigs.com/grace350.html
in dark blue, of course.
Then, get large syrofoam triangles like that, but shave them down to a much smaller size, and the correct shape. Get your second wig, the same color.
Perhaps this one? http://awesomewigs.com/cher9511.html
You then cut off a lock and hot glue it to the cones, without melting the hair or cones. I think you're supposed to cooly blow dry the hair and use hair spray to keep it in place. Keep doing that until you have enough hair on the styrofoam. You'd have to pick a certain way to attach the cones, because there are different ways. Headband, nailing it to the wig, gluing it, and what not. It really isn't so hard once you get the idea down and try putting it together.
The hair ties could easily be made of out of pink stain ribbon and a red bead, then glued to the hair for security.
Let me know how it goes! =D