https://github.com/lizzybot/vanitygen/
Unfortunately no binaries right now, though it's in the works. Compile it like you normally would.
Usage:
The -C flag has been added for CGB. OCLVanitygen also works with this flag with the starting character of "5". There is a bit of an oddity right now though in that it is saying some prefixes are not valid even though based on base58 and the avoidance of ambiguous characters they should be valid. We're working on hunting this down as well. In the meantime, most prefixes seem to work. Like any other instance of vanitygen, once you generate the corresponding private key, use the console in the wallet app (or command line if you're using the daemon) to "importprivkey" to your wallet. Then you're good to go.
Here's one I generated for the purposes of this exercise and added it to my CGB wallet: 5VANiTyhMuuk2CRQHRKC9epvUQUf97Pcaf
Any questions, please feel free to ask. Also, if you think this should be its own post elsewhere, I'm happy to do that too; though I couldn't seem to find any CGB-specific forums.
Thank you for your contribution to the community! Excellent work! This is an excellent example of how an individual can contribute to the community! I have sent you a few CB as a thank you!