Well, really, just think about what kind of themes you would like. The options are limitless.
You could have:
1) Mexican Restaurant or dessert theme
2) Boys and Girls Nursery
3) Pirate Theme
4) Casino (will be great if you had the Fast Track Treadmill and the kids like using it, especially if you had the sewing skills to make a fleece cover for it that looked like a roulette wheel)
5) Garden Theme (easy with the plastic strawberry you can get at any pet store, plus you can use your flowery stuff here and check out these foraging flowers from
Gliders and Gear
6) BlackDrappa/Tiffany had a Greek/Roman theme and I made this for her:
7)This pic would go great for a bakery theme (made for Roxysugarbabies for April Gift Exchange:
8)A Jungle/Tropical Island Theme (get some coconut huts!)
9) Nautical Theme (lots of dolphins, fish..not just rubber ducky-like toys but also check on the bead aisle)
10) Sun, Moon and Stars Theme (JazznZoeysmom has/had a cage set that looked INCREDIBLE for this)
...and the list goes on.
But like Lisa said, gliders really don't care about themes. Just bring the mealies and other treats.