According to decades of military research, multi-scale camouflage is the most effective pattern you can use for passive camouflage, and has become the basis for most passive camouflage patterns used today. The idea behind multi-scale camouflage is that your pattern has large chunks of colors, but those large chunks are super imposed with smaller patterns as well. This style of patterning is effective for 2 reasons.
- In nature, objects tend to have multiple scales like this. IE: a pattern of rocks contains smaller patterns of bumps and shadows or a pattern of branches contains smaller patterns of leaves, so on and so forth. So, multi-scale camouflage most accurately represents a typical environment you would need to blend into.
- When you use camo that has too small of a pattern, it loses contrast at a distance and all the colors blend together so that it fails to disrupt your outline. When your pattern is too big, it fails to disrupt your outline at closer ranges because the pattern blocks become large flat visual objects themselves. Multi-scale camouflage works at both near and far ranges unlike any single-scale pattern can.
So for Savana, you want a pattern that looks sort of like this:
One thing to note though is that the "digital" patterns used in military camo are not necessarily the best shape, it's just easier to design and manufacture. In nature, multi-scale camouflage can be made up of more amorphous shapes.
Of the existing Savana large game predators, the best camo probably belongs to the African wild dog because its fur pattern includes these sorts of large color blocks disrupted by smaller patterns. Their exact patterning is more ideal for the arid forests around the edges of the Savana than the open grassy parts, but by minimizing the the deep blacks, and focusing more on yellow, orange, tan, and umber using the same general patterning, you should have an ideal tall grass ambush hunter.