A while ago I used a printer's tray to make a wall hanging about my home. I got all of my photos and bits and pieces together then whenever I had a spare 10 minutes I made a mini layout - a bit like an ATC and then added it to the tray. I used Bella Blvd papers and Estate sale stickers along with some inks, embellishments and ribbons...
Speaking of ATCs it's not too late to join in our ATC swap - and you could use a printers tray to display your new ATCs - then maybe make more to fill it up?!