Ability to apply multiple Conditional Formatting rules/ colours to the same list item.

I have faced this issue with a few clients where they have requested multiple colours on a calendar/ large grid in order to easily identify what category a list item may fall under. 

It would be nice if we could write multiple rules and apply conditional formatting against each one under the same list item. Ie 0 will always be blank, 10 = orange, 20 = blue, 30 = green etc.