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Okay, as for painted beers. You can get anything from Natural Light glass bottles to Yuengling 24s to really nice Belgian magnum bottles. The idea is that each group should paint at least a couple nice ones (let's say at least Sam Adams quality, preferably above) and then several medium quality brews (Yuengling, Rolling Rock, Bud Select, Corona, Negra Modelo etc.) and then several lower quality brews (Miller Lite and the like). Remember, this is a labor of love. The look on every beer lovers' face as they pop into one of these mystery bottles is unforgettable ; )
Once acquiring the bottles, I've found the following method works rather well: Get a couple cans of neon spray paint (if it says it adheres to glass all the better). Apply two coats of this to all your bottles. Coat thoroughly and let dry for a day. Then, paint each glass bottle with acrylic or glass paint thoroughly. You can put all kinds of designs on them, stickers, people's names, designs whatever, it's completely up in the air. Then let this dry for a day and you are good to go.
The concept behind this is that the spray paint provides a base for the acrylic to adhere to. You will quickly find that most paint doesn't like sticking to glass so much, but two coats of the spray paint fixes that problem.
In any case, happy beer painting!