Instead of writing a couple of addresses, just cut them out. This way you can just send a piece of wood and your buddy won't mind that it doesn't literally say anything. The material speaks for itself. Besides, sending an old-fashioned message is what email and IM and text message and cell phones are for.
Step 1: Cut It Out!
Or burn it out. I grabbed the nearest stencil font I could and dumped in a couple of addresses in Illustrator. I then sent that over to a laser cutter and after a few tests with the material I cut out the whole thing. If you do this, it's important to reverse the stencil since the wood can get charred. I could've tried to clean it up a bit, but I like the burnt effect in there so I left it.
Step 2: Look Really Closely
Do people really click through the other images? I just wanted to highlight this macro photo and looking at the finished work doesn't "do" anything really. But it is fun to do.
Step 3: Stamp It and Hope*
I was hoping to talk to a postal employee about the postcard before I mailed it, but no such luck. The line was long so I went to the automated machine instead. A 63-cent debit from my card and I had a sticker for official stencil travel across the lower 48. Now to wait and see if it makes it.
Step 4: Success!
The postcard made it through, but not in one piece. Oddly enough, it split in a vertical line and not along the grain. I think that it was going through a curved mail sorter and couldn't make the turn.