I had a Trenz Billet on mine, and got tired of it, so as I slowly transform my truck to be completly void of shiny stuff, I had the Billet bowtie and grille insert powdercoated Black. I am happy with the look, but the guy that did it isn't very good, so the job could be better, but you have to look close to see it.
I have also read about guys taking scotch brite to their factory bowtie, and then using Krylon Fusion to paint it black. Not sure how durable it is, or what's involved with the prep, but that is another route.
Here's mine the day after I got it done.