Badges update automatically and link to the resource pack page on MineUniverse.
This is something that I've been wanting, but nobody else had the same idea... Or at the very least, nobody would share what they created with this idea.
So, I started up Universe Sandbox 2, made a custom galaxy, and took a few screenshots. With that done, I stitched them together using a skybox template, using a big screenshot of the Just Stars background from universe sandbox as the base so that everything looked good when I pasted the galaxy screenshots in, and now I have a working night time skybox with Spore style galaxies.
Final Side notes:
I don't know which of the primary categories this skybox fits in.
I believe it should work for most versions of Minecraft, but I am uncertain of if that's a matter of fact.
I am too lazy to test for compatibility, but it should in theory work fine so long as you have a working version of optifine.
