Making a new material is very simple, all you need is the image and an existing material file.
If you were to make a rock texture, go to your Feralheart > Media > Objects > Rocks and copy and paste the one of the .material files. Re-name it to whatever you please. Then open it up in Notepad.
Delete everything there and just leave this script inside:
material
rockMat{
technique
{
pass
{
cull_hardware none
cull_software none
texture_unit
{
texture
rockTex.jpg }
}
}
}
The parts I've highlighted in red are the parts you need to change. The first one is the material name, so what you would need to type into Object Maker to make the new texture show.
The next part is the image. Type in your image name and format, remember all capital letters if used. Not sure if the code still works if you change the image format to .png.
This script is very basic, you will have to explore the Feralheart folder if you want to make an animated texture. I hope this helps