I used to have a mod for KOTOR 2 a few years back that let you play as a Purple Twi'lek. I'm almost positive it was the one described here LucasForums - [TSL] Purple Female Twi'lek Selectable PC Head but the links no longer work, and I can't seem to find it anywhere else. Can anyone help me and point me to it? Thanks to anyone that can help.
Maybe ask the Author?
I checked his profile, he hasn't logged on in about two years.
There is a mod in the KotOR part of Filefront that gives you I think six different implants (through cheating). Every implant changes your head to a Twi'Lek head of a different color (3 male, 3 female). If you can't find the mod you were asking for, you could use that one as an alternative.
No need Astrokreep already got the mod :)