Hi - I've been playing around with a colour-picker widget for
emacs, and have gotten it into a somewhat usable state - would
upstream be interested in adopting such a widget?

M-x colour-widget-test RET after loading the file to see it
in action.

By default it displays all the named colours, but it can take a list
of colours to display instead. It works on the console too, although
it's not quite as well laid out there (can't stretch spaces on a
terminal with display properties, so the squares aren't, er, square).