People who wish to merely use the stylesheet would only need to drop it on the page.) (My thinking here is that if you care enough to produce a custom theme, you are probably happy enough having to run a build step.
Provide a mechanism to produce a custom build of the styles, using a customized list of named color variables.
Add a preprocessor and refactor to use a centralized list of named color variables.Reduce the number of colors in the default style sheets by consolidating duplicates (and near duplicates).It seems that it would be desirable to do some or all of the following: I added a preprocessor in aed3bd9 (specifically for auto-prefixing), so there is already some precedent for preprocessing the CSS.