You just have to change it back the same way you changed it, its not hard, you dont need to make a copy of anything.
Slot 1 = Sand_D.png
Slot 2 = Sand2_D.png
Slot 3 = Sand3_D.png
Slot 4 = Sand4_D.png
Slot 5 = Grass_D.png
Slot 6 = Grass2_D.png
Slot 7 = Grass3_D.png
Slot 8 = Grass4_D.png
Slot 9 = Sediment_D.png
Slot 10 = Sediment2_D.png
Slot 11 = Sediment3_D.png
Slot 12 = Sediment4_D.png
Slot 13 = Moss_D.png
Slot 14 = Moss2_D.png
Slot 15 = Moss3_D.png
Slot 16 = Rock_D.png
It'd be nice to have a reset button, but it's nit really super necessary.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Primary Laptop:
i5, NV1050 4GB, 8GB memory, 1x 1TB HDD, Win10.
Secondary Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.