Hello,
I'm assuming you meant "controls" or "functions" palette instead of "color" palette, judging from your comment above about the 5 palettes already available. Anyway, you can search the LabVIEW on-line Help for "palette" and several topics will come up, most noteably "Creating and Editing a Palette View", which will help you get started designing your own palette or sub-palette.
And if you *were* referring to color palettes, there is an example on the NI Developer Zone (www.ni.com/zone) entitled "Customizing Color Palettes" that should help you out.
Good luck with your application, and have a pleasant day.
Sincerely,
Darren Nattinger
Applications Engineer
National Instruments