Maybe I should start drawing on the bulletin boards. I'd usually just draw a smiley face on peoples' bulletin boards whenever I visited their islands. I drew booty fruit on my friend's bulletin board. I won't post it here, though. It's not really offensive or anything, I just don't want to get in trouble.
I'm not artistic enough to actually draw on my board, but whenever one of my villagers is in boxes, I like to write a goodbye message to them on the board lol