They're easy enough to take off and paint. In a DS4 you're not gonna even have to make sure it high temperature paint as they don't get that hot (high temperature paint is for track brakes) but I'd not be inclined to go with white as they'll stay white probably until you tighten the last bolt, before you even pull away
I did this painted mine red, and got citroen WRC decals in white looks good.Daz778 go to evilbay and buy paint for calipers (is high temp anyway) and costs about £6 for a pot - lots of colours (you wont use half of it). The decals cost about £5 (again many colours). Get some degreaser and a wire brush, lift one side of car, clean up calipers, then paint - I did 3 coats - then put decals on, drop car do other side. Simples!