Arduino project enclosure ideas?

Hey guys, I'm looking for an enclosure for my latest project. I know that there are tons of so called "project boxes" online, but I'm not looking for a box. I'd like something cylindrical or ovoid, preferably aluminum but I can work with plastic, and it needs to be large enough to fit a Pro Mini inside. I've done a fair bit of looking but so far I'm coming up blank. Any ideas? Maybe I could even repurpose some random household object and use it as an enclosure.

Maybe PVC plastic pipe with end caps.

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cigar tube, mints tin,

Hammond manufacturing make more cases than you can imagine. Most of them are simple boxes but they have a huge range. I usually buy them through Mouser.

This one will just barely fit a Pro Mini, if you file the corners down a little: http://www.mouser.com/Search/ProductDetail.aspx?R=S1A-201209virtualkey54500000virtualkey789-S1A-201209 With a custom PCB under the Pro Mini, I've got these measuring temperatures, translating serial data and all sorts of things.