Wow, thanks for all the hints. I stumbled across the Christmas ornaments hint somewhere else since I posted. I hope I can find those at Michael's or Joann's. I will also keep my eyes peeled for those baseballs. I just want something lightweight, so I don't know about those. But, since they're egg shaped it's probably not what I'm looking for. But it's good to have them as an idea and in stock for future projects. If I can't find what I'm looking for, I might just order a couple of the Plastruct domes.
For Roderick I used white plastic spoons...
@Rikka: I'm from Germany, so you should be less surprised

. I just love those lemmings...
And thanks for the warm welcome everyone! I have a feeling I'll be happy here

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