Generate color codes

ChartDirector is a really powerful chart library.
Unfortunately, the colors in the standard color palette are a bit old-fashioned. I would be grateful for tips on generating at least 20 matching, modern-looking color codes (such as &hD9E5E1). What experiences have you had with corresponding websites or (free) tools?

have you tried colors from HSL HSV?

I pass to CD the list of Apple’s more pastel colours to use instead of the garish default colours.

Thanks: I am looking in the same direction now.