I found this background in my stash that I made several years ago. By checking out the colors, I think that I used Marvy Metallic markers on acetate, then smooshed the black glossy cardstock between the layers. I used a black layer under the background and put it on a lavender base card to highlight the colors.
The Marvy Metallics can be put directly on the rubber and stamped. I used this solid iris stamp by Stamp A Mania on black cardstock. I attempted the sentiment, but the details get run together. I used a copper Encore inkpad for the Happy Birthday.
The glossy layering really makes everything pop and the ribbon pricks up the purple in the background. Both image and sentiment are raised with foam mounting tape.
I'd love to make more of these, but will go onto use other backgrounds from my stash of samples.