It's white, just dye it any color you like. You can use any kind of dye like Rit, liquid or powder. Just find a color you like, find a container that will hold enough water to cover your part, fill it with enough boiling water to cover your part, add your dye, let it cool a little (especially for softer plastics), then put your part in. Check it every few minutes for color, it will get darker the longer it is in the dye (depending on the color). Once it is the color you like, remove from the dye bath and rinse with cool water to set the dye. Dry the part and re-assemble your keyboard. You now have a custom-dyed case!
MX compatible just means that they mount to a cross shaped stem. The switches that come with this board will support them just fine. The thing I would be more concerned about with this board is the short right shift key. A lot of cheaper cap sets won't include that since you only find it on 65/75% boards.