Who says post-apocalyptic equals monochromatic? The "Greenworld" mod for Fallout 3 lets you spruce up your blighted surroundings just in time for the rebirth of spring.
Modder Khyrin1129 came up with this patch, which puts foliage on the trees and green grass on the ground. And Super Mutants twirling in the meadows like the Sound of Music. OK, kidding about that part. But it does make your slogs through the wasteland a little less wasteland-y.