In my BOP I followed a LED insert guide and colour matched them all except yellow, and used frosted whites for the yellows. It all looks perfect.
On my Gorgar it was a different story though. Orange frosted for orange inserts look really dull, and white was too white for the yellow inserts, so I used frosted yellow LEDs which look great.
I think what I'm getting at is, experiment and you'll find the right LEDs for the job.