I have made some Christmas decorations from slide mounts. I was trying out ideas for a slide mount swap but didn't get things done in time so I've missed that one.
I coloured the slide mounts by putting some marvy metallics on a non-stick sheet and spritzing with water. I then put the slide mounts on and squidged them around a bit to cover.
I finished them with some stamping and embossing or a metallic edge. The middles of the pinker two are stamped on acetate, one see through and the other with some kitchen tin foil in between coloured with rub'n'buff gold.