Stainless steel decor in moderation just seems to work in the Smarts interior.
If you look either side of the
speedo there are two small circles, stainless covers could be had
for £1.99 at B&Q, the end caps for curtain rails can be bought in
several different colours and finishes, brushed stainless being one
of them.
Fitting is just a case of snapping the clips off the back and gluing it in place.