Well,
From what I know (correct me if I'm wrong too)

most Pyramids are coloured paper/card under clear plastic (bar models such as the JEMPBK, UV7PWH and UV777BK which I think are MOP)
If you want to recolour the inlays then you will probably have to remove the plastic top shielding and recolour the paper/card, but removing the plastic is not an easy task and will probably result in some damage.
If you want to re-do the inlays professionally and in different colours then i'd seriously suggest you have a word with Jeremy
www.lgm-guitars.com
(His site is down at the mo' and moved to a different url but I'm not sure what that url is, plenty others on here will know I'm sure)
He is the guru.
Steve