Pretty good responses so far... It looks like the bats in the photos could be metal with something like enamel to provide the color. I've divided this reply into 3 sections, depending on what materials you'd be comfortable with. Feel free to skip around...
1) SHEET METAL
If you are at all arty, good with tools, or brave and willing to learn you can get a hunk of sheet metal, like aluminum, trace the bat shape onto it with a grease pencil, and use metal shears, a hack saw or jeweler's saw, and/or files to make it into a bat shape. Then you smooth the edges with some wet/dry sandpaper for metal. This is jewelry making 101 stuff.
I suggested aluminum because it is soft and easy to shape, and you can find jewelry-sized pieces like that cheap or even free, if you're a good scrounge. The process can be a little messy, and it's smart to wear eye protection and maybe a gauze or paper mask so you don't inhale any metal dust.
If this all sounds overwhelming you might be able to get somebody to help you, or do the whole job for you out of kindness or for a couple of bucks.
There are "cold" enamels available to color it. They are colored plastic resins that will go on like paint, and will stick well to clean metal.
2) SHEET PLASTIC
You could also use sheet plastic, using a coping saw or jeweler's saw and files to get it into shape, and sandpaper to smooth the edges. There are specialty shops that sell Plexiglas or other sheet acrylic plastic, or you can go to a thrift shop or yard sale and find something with plastic sheet that you can cannibalize. If it's the wrong color you might be able to use model paints from a hobby shop to color it the way you want.
If you decide to try using sheet metal or sheet plastic, work using an old table or workbench, with one hand holding the material down firmly, and partly hanging over the edge so you can use the saw or files on that part while the rest is supported. There is also a special device called a bench pin used by jeweler's and metal crafters which is a piece of wood mounted sticking out from the edge of a tabletop or workbench, to provide support to your piece as you cut and shape it...
3) POLYMER CLAY
If you wanted to try another way I'd go for polymer clay, like Sculpey III or Fimo or one of those, which you can find at almost any arts and crafts or hobby store. This stuff is actually a kind of PVC plastic, and not related to ceramic clay at all.
You'd need to roll a piece out flat to the thickness required, like sugar cookie dough, and cut it out into the bat shape before you bake it. Follow the baking instructions on the package, and because it's thin make sure that you don't overcook it and burn it.
Polymer clay is great for making matching beads too - round ones, tubular ones, whatever you need. You can find books at the library and tons of info online about working with polymer clay. I tried making some beads with it once and sold them all on eBay and at a craft show, my very first try.
What you'd be doing is jewelry making, even if it's not with gold or diamonds, so look around online for some tutorials on the basics. It can be pretty fun.
This first link could be just what you need, but look at the others, too...
Just remember... when it comes to art there are better ways to do things and harder ways to do things, but usually no one *right* way to do things. I don't make jewelry anymore myself, but if you get desperate you could go to Etsy.com where a lot of artists including jewelry makers and polymer clay artists show their stuff, and some of them take custom orders.