I'm working on a possible sticker design for Low-Key Hillclimbs.
Here's the design. It has a transparent region so it's important it has decent contrast against any color bike. So I preview some colors here (if the backgrounds don't work, check this link).
Maybe I can get these printed up by Sticker Guy or someone similar. The smallest size StickerGuy sells are 2.75 inches by 2.13 inches. But I could always do 4 stickers on one die. Then I'd have 1.375 inches by 1.13 inches, plus a margin, getting the printed area down to something more suitable for a down-tube.
So here's how that would look: