Waning and Waxing.

Can you tell what these are?

A clue?  They started out like this:

Shiny, gold circle thingys that have been junking around with my random hardware stock waiting for a little beautification.  

So, inspired by the waning and waxing of the moon, they all got a little variation of this:

Now please don't get technical on me...I don't actually know anything about the actual moon waning and waxing.  

I know there is fault to be found in the actual sequence of "moons", so if it bugs you, 

just imagine this piece was inspired by eyeballs instead.

The "canvas" is a leftover cabinet door via IKEA.

What have you been hoarding in your hardware boxes?