Not sure if the reflection is cooler. Painted glass
Love it 
what type of paint?
Cool! Same paint I’m using only I chose black
That is quite cool. Brings to mind ideas for some shadow based artwork. Could use little pieces of glass like you’ve used, just shine the light through & use some kind of lens to spread the shadow image more.
You can also use this method to etch PCBs. Paint, etch, acid bath to remove copper, acetone to remove paint