Get a wig, definitely. There are a for other forums about this, but spray is icky and it flakes. Not to mention it's not exactly easy to spray a pattern like that into your hair.
As for the brooch, I made mine out of air-dry clay, then painted it and attached it to a clip. The rings I got from http://www.salesmanb2b.com/index.php/product?id=40014
They're cheap and pretty good quality. Not sure what size they are though, and you can't custom size them. They're a bit tight on me, but I'm asking a friend to expand them just a tiny bit. If you don't want to go that route, you could probably make it out of clay and wire of some sort.
As for liz and pattys hats... I really can't say much there. Maybe get a few cowboy hats and attack them with scissors, fabric, and hot glue?