This could be used for a 2x2 painting for 16x-512x packs or a 4x4 one for 16x-256x. (It wouldn't really look good as a 1x1 painting, and can't be resized to anything smaller than 32x32 pixels without loosing almost all the detail.)
(some imperfections might be visible on this one as it's close to the size I worked on when creating the image)
Here's one I was doing for a custom pack for the ocarina of time recreation I'm working on. It's the painting from the phantom ganon boss fight. I did it a little weird though. It's done between 2 different painting so you have to put both up to have the full pic. Done in a standard size file.
I run a server with a bunch of mods. I like keeping my members on their toes; I mess around with the jar's internal default art. I don't have much for kz.png, but tonight I made an awesome replacement to moon.png: