|The not-so-lovely tray before|
The scrapbooking ones for the larger books fit perfectly and I just had to cut about 3 inches off one side and an inch or so off the top. I put a piece of scrapbook paper inside (reversible makes it fun to change it out) and then just stuck a few little spider cut outs inside.
If you just tape them down, you can remove them for the next holiday. I thought they would look great for Thanksgiving also, so I will put the leaves in next week for Thanksgiving.