First I found a photo of some real porcelain knobs. VintagePlumbing.com has lots of them as well as other really cool old bathroom and kitchen fixtures.

So here we go. Anyone can roll out a snake with clay. Even me! LOL
I made some skinny snakes out of FIMO clay then cut a piece about 1/4" long. Then I cut another piece in half and added them to the sides. When they looked like a cross I added a teensy flattened ball to the center.

Then I popped them in the oven to bake. It took about 15 minutes at 275. I kept checking on them to be sure they didn't burn.

I only need two. Let's hope there will be two that match?
Tomorrow I'll show you how they turned out. Or maybe how they didn't turn out?
Sweet dreams!