I always wondered how to make these textures in a .bit map, some1 explain?
1. Load any pic of your choice into GIMP
2. Select Image/Mode/Indexed... from the main menu
3. Put exactly these options in the newly opened window:
(http://i.imgur.com/ayqVE.png)
4. Original and final image
(http://i.imgur.com/Er6jO.png)
Thanks a lot barman