Here is the sketch:
Marty may have drawn flowers, but considering the season, I saw snowflakes.
Everything was stamped in white and embossed. They don't really show up in the photo, but there is a little sparkly sticker in the center of each flake.
To see what the rest of the Gotham City Stampers DT did with the sketch, click here to visit Heidi's blog. Everyone interpreted Marty's sketch so differently, and I think you'll enjoy them all.