I attached the textures below.
All textures (except for MNTS01, which is the base) were made by me by using GIMP's "Light Effects" function.
All the textures don't have any background, so you can apply the background of your choice behind them.
Also, the textures loop nicely (horizontally).
Since they are already paletted, just put them into SLADE and convert them to Doom Graphics and there shouldn't be any color change issue.
You can use these where you want. And credits aren't needed.
