I've seen some interesting designs, and great fabric finds for many of the builds here. I have started working on the logo for my teardrop, and thought about how I could incorporate that into the design. I'm still debating on how to decorate the interior as well, and found a site called spoonflower.com. The allow you to create custom fabric of your own design for use in pillow cases, sheets, curtains, etc. They also let you create your own wallpaper designs. Although a bit pricey, there isn't that much real estate in a tear where this would be overly expensive to get the custom look.
http://www.spoonflower.com/designs/new?create=fabric