Accents

focus attention on, bring/call/draw attention to, point up, underline, underscore, accentuate, highlight, spotlight, foreground, feature, give prominence to, make more prominent, make more noticeable, play up, bring to the fore, heighten, stress, emphasize, put/lay emphasis on

Interiors are predominately made in “Safe” colours such as black, reds, grey, creams and beiges with very little or no accenting colours. Unfortunately, this can become a bit tiresome and an injection of colour is what’s needed. From something as small as a gear gaiter set, new seatbelt material to completely changing the colour of stitching on your seats, colour changing part of the dashes leather to show detail/lines.
Look inside any car with a black interior, it’s a void just waiting for colour. Something to accentuate the lines around tops and sides of the seat, to add definition and really show of its shape, bring it to the foreground and make it stand out. Most accents can be reversed so’s not to impact the resale of a vehicle so you can add as little or as much as you like.