+color::
+ The value for a variables that takes a color is a list of
+ colors (at most two) and attributes (at most one), separated
+ by spaces. The colors accepted are `normal`, `black`,
+ `red`, `green`, `yellow`, `blue`, `magenta`, `cyan` and
+ `white`; the attributes are `bold`, `dim`, `ul`, `blink` and
+ `reverse`. The first color given is the foreground; the
+ second is the background. The position of the attribute, if
+ any, doesn't matter.
+