Board Thread:General Discussion/@comment-26417171-20150607043208/@comment-15419758-20150806214826

For space mapping and mapping with textures, you'll need Paint.net instead of regular paint. If you have Paint.net or something better (like Photoshop), great! For mapping with textures, click Viper's link above. As for space mapping, you'll need to make the nations' colors transparent.

Quick Texture Tip: If you want grass textures for regular mapping, what I do is make a new layer at the bottom completely filled with the grass texture, and then add the map layer on top. I then select the land in the map layer with the magic wand tool set to global selection mode (you may have to adjust the tolerance depending on the difference in color between land and ocean), and delete the selection. The land becomes transparent, and the texture shows through, with the ocean covering the rest of the texture.