I have received my donation in a variety of ways. I don't have a preference per say. Although I have stated on my website the whole "envelope" deal, that doesn't always happen. I used to think that anything besides that would cause an awkward feeling. I have found that that's not the case at all. I've seen regular envelopes, bank envelopes, greeting cards (one was actually sealed, lol), and plain old folded bills. Of course, if someone asks, I would kindly refer them to my etiquette page on my website. Honestly... you could "make it rain" on top of my head as long as it's the correct amount, lol.