Badges update automatically and link to the resource pack page on MineUniverse.
What's the PC Gamer Demo? It was shipped with an American issue of PC Gamer, a British magazine. The Minecraft Wiki has more information.
Besides letting you play for five in-game days before you lost the ability to interact with the world (so as you let you try Minecraft before you commit to purchasing it), it also has cows with PC Gamer branding on one side of their bodies.
Cows' textures and models have changed since then, so I put the PC Gamer branding, copy-pasted from the cow texture from that demo, onto the modern cow textures. Not Mooshrooms, though, because the demo predates Mooshrooms being added to Minecraft.
And I didn't just add it to the temperate cow textures. I added it to the warm and cold cow textures too.
