The United States Postal Service is now offering Go Green stamps. Each one features a go green tip such as, "recycle more," "plant trees," "use public transportation," and "adjust the thermostat." These are part of a whole line of Go Green stuff including recycled tote bag, postcards, and more. Most of us need stamps anyway. Why not use them to make a statement on a topic that's important to you and educate along the way?
Personally, it kind of makes my day to put my Go Green stamps on my recycled paper envelopes (yeah, still using that same box). It's the little things.