Look outside. COLOURS! SO MANY!
The whole ‘hyper-realism brown everywhere’ thing is not only stupid to begin with, it’s also really, really old. Stop doing it. The real world is much more interesting, and it looks a lot prettier. Wars don’t magically change the colour of the sky to brown (at best they’ll turn it blood red as the sun filters through smoke, something I’ve personally experienced a few times during our summer bushfires and it’s cool as hell). They don’t turn people, their gear, their weapons, their vehicles, and anything else nearby the same shade of brown. The desert is not brown. Even in some of the most bleak and generally shitty places on the planet, the colours of the environment vary. Afghanistan and Iraq both have green belts along the major rivers which are as lush as any European countryside, bordered by a bit of sand but dominated by mountains half-covered in thick green vegetation and then towering into the deep blue desert sky in varying shades of grey. The colour of a desert can be brought out by variations in the makeup of the local sand, soil, and stone; it can be almost white, it can be various shades of brown, it can even be bright red and yellow (there’s actually an area in Africa - I think part of the Kalahari - which has zig-zag patterns of red and yellow sand because of mineral deposits). Here in Australia, deserts are red. The only brown you’ll find anywhere is the beach.
The colour of the sky can also change depending on what’s being blown around; about the only time it’s truly brown and hazy like you guys tend to believe is in the middle of a big fuckoff sandstorm. Don’t forget shit like mirages, too - they really do add a lot of colour.
During the North African campaign of WWII, the British camouflaged their vehicles with pastel blues, yellows, pinks and greens. It actually worked better than the overall brown the Germans used, because the desert IS colourful.
Long story short, find some originality, find some inspiration, and get to work making some pictures that actually look interesting again.
I might add some example pictures to give you guys something to work from later on, but in the meantime, I hear this Google thing’s pretty useful.