Ages ago, I found this image:
And I set it as my desktop wallpaper and it made me smile each day. It's been replaced about a dozen times by now but I still remember it. Yet I have no idea where I got it or who made it, until now.
I stumbled across this post at Twig & Thistle. And I can't believe it. It's not just the H image but tonnes more. Turns out they are drawings on post-it notes and they're by Marc Johns. You can see tonnes more on his site here.