You've requested it, now i'm going to try to cover it, how to make fake, ancient looking, bones. These can be used for fake crime scenes, anything involving cavemen, or even broken and spirit gummed to skin for major injuries or advanced zombie make-up, and thankfully won't cost a ridiculous amount like if you ordered professional resing cast bones from a medical supplier.

Start with some styrofoam tubes and spheres. Measure the bone for how long it should be, you can use yourself as a reference for how long the bone should be, mark the tube and cut it.

After you cut it the proper length (for whatever bone you choose, I picked the femur) you can start to carve it, I use a box cutter to carve the basic shape.

Make sure to cut AWAY from yourself and keep your fingers out of the way. Keep on cutting until you get tapered cuts from both ends towards the center, like this.

You want it smaller in the middle and wider at each end, use photo references for whatever bone you're trying to form. After you get the general shape, go over it with some sand paper to smooth it out, like this.

Sand it for a while until you get a smoother taper, more like this.

After you get your core shape, you can add on the sockets on either end. Get one of the spheres, and carve a hole out of it.

I pushed it against the core bone shape, and shaped it into a kind of muffin or mushroom shape just with my hand, pushing and molding the foam. After I got the shape I wanted, I just hot glued it on.

After hot glueing it on I let it dry, then started on the other end, shaping the other joint in a kind of 3 bulbed bulge.

Once again, I carved a chunk out of one end of the sphere so it fit firmly against the core bone, and molded it again, just with my hands, then I hot glued it as well.

After the other end dried, I painted it white with some simple acrylic craft paint. This helps seal the foam, and cover up the seams of both of the joints. If you want just a basic bone, you can stop at this step right here, just hit it with a hair dryer and move on too the next bone. BUT if you want the bone to look more natural, and have some color, keep reading.

I mixed some dark tea with some white glue and brown acrylic paint, and painted the bone. You could also probably use a dark soda or chocolote syrup if you diluted it.

It gives the bone a more realistic color, kind of old and dirty looking instead of clinically white, which I think makes it look much more realistic. Hitting the little crevices with additional paint can darken it a bit and make it look like it has a little more depth.

For other bones, you'd work on the same basic concepts as this, just use more foam and keep carving and molding with your hands, and there aren't a lot of bones you can't make pretty close approximations of for whatever project you require.