Asnlong as it's heat-safe you can use any glass bowl/Pyrex. I often use a size larger than I think I need because the cake is going to be a bit smaller than the bowl. Make sure to level the top before you turn out the bowl...if not the weight and heat of the cake will split it when you turn it over. I made my Santa cake with glass bowls and the snout/nose for my monkey cake using glass bowls! Good luck!
I bake in Pyrex bowls often. Here are the tips I can think of:
- grease and flour the bowl
- reduce usual baking temp by 25 degrees F (cake browns faster in glass)
- you may get a bigger hump than you do in a regular pan
- when you test for doneness, a wooden skewer inserted in the middle of the cake should come out with moist/wet crumbs still clinging to it. If you wait until a skewer comes out completely clean, most of the cake will be overdone and dry
Hope that helps. Good luck 
- michelle h.
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