Took us ages to decide colours, wanted something to match the scheme but not bland.
We went for a warm grey inside - found a - er - loose bit on the trim on my Airbus at work, got it matched.
Same for the panel, I was driving a Chrysler rental and really liked the interior darker grey colour - would you know, there was a loose bit of trim in the rear !
The paint shop is used to me bringing bits and pieces in now - I usually get a rattle can made up to match, then if it is OK, go for 30% flatting agent which takes the shine off really well
