Cheers, but I seem to remember reading that the grass was actually quite lush in January (if not as verdant as European grass) not as it is depicted in the Zulu film. Obviously you lived there but was it straw-coloured all year round?
Correct, the colour does vary considerably with the seasons. And the summer of 1878/9 was particularly wet, and according to accounts the grassland around the East slopes of Isandlwana was not grazed much that year, so was notably long - think at least knee high and up to waist high in parts. And light grass green.
Have a look at these:
Summer:
Winter:
In the last pic the ruined walls are at about 50cm tall at their highest point. So the ungrazed grassland would be as tall as that, but as green as the first pic.
In terms of a colour reference for the red soil, think traditional artists' "burnt sienna".