Not directly FastSPI related,

Not directly FastSPI related, but well useful!
http://cloford.com/resources/colours/500col.htm

Nice!
The 140+ named colors that the library supports are listed toward the bottom of this file:
https://code.google.com/p/fastspi/source/browse/branches/FastSPI_LED2/pixeltypes.h

We included the “standard” HTML/web colors, at least, so you can do this:

leds[i] = CRGB::HotPink;

On a side note this was incredibly useful for my sister’s wedding. It was fabulous to be able to use CRBG::HotPink and CRGB:: Fuchsia.

I had a really hard time picking colors using HSV. Is there a mapping table somewhere?

Glad the color names were helpful!
There’s not a full color table – yet. The closest is the small table on this page
https://code.google.com/p/fastspi/wiki/CRGBreference
(Search down for “Orange” to find it.)

I hope to put together a bigger, more visual, color chart, too.

Ah, that helps a lot. Thanks Mark!