Chris, as many tile roofs as there are by you, there should be a reclamation yard somewhere that you can find some matching tile. Pull some from a less oblivious section of the roof and use those where the chimney was if it's a high visibility area.
The reclaim yard only had the off color. I searched and searched. The worst part was the more you wanted them the more expensive they got. It's in the least visible spot already. I'll hit them with some spray paint and forget about it.