What I did with my badging after I removed it was take a small bottle of touch-up paint (body color in my case) and painted just the raised part of the letters with the the little brush. In your case, I would suggest a black paint rattle can. Scuff up the surface a bit, lay down plastic primer, wetsand the primer if you feel like it. Lay down a few coats of the black, and lay down some clear coat since your lettering will be exposed to the elements. Regular autozone rattle cans should do just find, as I did that with the grills on my car and it came out relatively ok (until the car got in a fight with pebbles falling off of a trailor on the highway... and lost).
2002 Chrysler 300M Special, DSB | 2007 Dodge Charger R/T Road & Track, BB
2000 Dodge Intrepid SE - Champagne | 2001 Dodge Intrepid ES - Sapphire Blue Pearl | 2003 Pontiac Grand Prix Ivory