I made this pattern by re-purposing RPG20XX's editor, each Z layer was side by side to make either a 128x16 map or a 256x32 map become a 16x16x8 or a 32x32x8 pattern. This isn't a user friendly method at all.

The ability to add your own easily as part of a mod will be introduced with mods. However, mod support is a massive feature. I need to make a game people actually want to play in the first place before there is an audience who wants to make and use mods for it. When and ever if the game becomes popular enough, then I'll start adding in mod support.