Color increments of 50 - at least for grays if not all

[elieven]

In building app UI there frequently comes a need for more gray shades - probably more than even having a scale with steps of 50 would provide. This can be to some extent done with opacity and any background bleedthrough can be solved with a wrapper element with a solid color background but this is quite cumbersome. It would be much nicer to have more gray shades. Perhaps even some way to dynamically generate them in other step sizes.