Banner patterns in Minecraft are one of the most interesting ... in the format shown above to craft the Skull Charge banner pattern. The thing is based on the old Mojang logo.

as well as the thing, flower charge, and skull charge banner patterns. Here are the steps to make it in Minecraft: Apply the red base gradient pattern using red dye and then use the black dye to ...

Minecraft shields are not upgradable, so it's one size fits all, but they can be customised using a banner to cover it in your own design, and they do have a handful of compatible enchantments.