I painted mine to match the dash when I refinished the interior. I have a set of brown ones (somewhere) that can be repainted in blue. Depending on the area, my interior Blue has some in SEM Shadow Blue, and other in USA 1 81 - 87 Blue.
Clean them up properly with SEM soap, use the SEM Solve Degreasser, use the correct activator by SEM and then do light coats sweeping both side up and down angling all around with light bursts.
If you dont have yours and want the challange to paint let me know. If not, I will be painting some seat belt sholder swivel covers in Shadow Blue shortly and I could repaint the brown ones ... (if I can find them)