After the case was covered with paper, I attached the lid. To build the bottom up, I added styrofoam. It also makes a great base for anything you want to glue down. I had this sweet deer that I've been saving for ages - you might remember this tutorial from a few years ago for making dies 3D - that was perfect for my scene. Unfortunately, that die is only available by special order now, but any deer that's about 3" tall would work. I also added one of Tim Holtz's Woodland Trees with pearls, some vintage ornaments, and greenery. It's all tied up with a piece of Crinkle Ribbon and a Christmas Key.
You can find Eileen Hull's Train Case die, plus lots of others by clicking the image below. Don't forget that shipping is free when you spend $25+!