I used Xenon Depot's 30W CREE LED fog lights, purchased along side my Xenon Depot HIDs for low/highs. I recommend them, they match the HIDs and DRLs perfectly, and are plug and play. Definitely want to go with LED fog lights rather than HID fog lights, because of quick switching between "high" (shutter) and fog lights.
Did you have any issue with flickering? did you have to get the anti-flicker "kit"