I suggest that there should be a variant of desert, that is not hard to find. With dark colored mountains like the ones in Northern Mexico. The mountains could be made out of dark sandstone, which is a dark brown color instead of a tan color. Dark Sandstone could be used for the same thing as sandstone, just a different color. Dark Sand could also be on these mountains, its uses could be the same as sand. Cacti could stay in some variants of this biome, and in some other variants of this biome, there could be no cacti. I also suggest that there could be desert shrubs in this desert, they could be used for the same thing as dead bushes, sticks. ( desert shrubs are also mentioned in my idea called "Better Badlands") Because there are tons of bushes in the kind of desert I'm talking about. Desert Rabbits could also stay in this biome. There can also be a variant of Desert M where the mountains aren't made out of Dark Sandstone, but normal Sandstone, and normal sand. In both main variants of Desert M, (Dark Sandstone, and normal Sandstone Mountains) some mountains would be high enough to have snow. Some of these could also have sparce trees, or thick trees. They could be taiga trees or decidous trees. But if the mountain is snowy at the top, taiga trees would be the only tree that could go on top of the mountain. Because, in real life, decidous trees would not be able to grow in that cold of a climate. Please use this idea MOJANG, thank you for looking at it.