I made some of these yesterday and my mom and I hot glued felt to the bottom of the tiles. I also found some cool scrapbooking stickers that I had socked away and used them on top of scrapbook paper. I'm really pleased at how they turned out.
The pink and white ones are for my brother's girlfriend and the travel ones are for me. I plan to make two more sets for my mother-in-law and sister-in-law. Super easy, cheap, and quick.