Stationery thoughts

Considering the colors of my logo and the retro feel I'm going after, I'm thinking of using an off-white/cream color for my stationery. I haven't really been so apt for searching out eco-friendly paper, but I think I need to start looking for better choices of environmentally friendly paper sources. I'm thinking that a square format might be interesting, as opposed to the typical 8.5x11 letterhead...this would reference album covers. The format would also mirror my specialty item, which I plan to be some sort of '45 in a record sleeve that's some sort of mailer/advertiser/music sampler. A square format for the letterhead would also be appropriate considering the store owner never has much to say at all...definitely wouldn't need all the space of an 8.5 x 11.