Quote Originally Posted by Fax Celestis View Post
You could just use an uldra (sort of a small fey from Frostburn), switch the Fey type for the Humanoid (Reptilian) type, skin them as kobolds, and go. It's simple, straightforward, and not overpowered.
Or the Domotrovio (another small fey in Frostburn): replace Fire immunity with Cold immunity:

Replace At will Produce Flame with Ray of Frost
Pyrotechnics with Snowball swarm.
3/day Flaming Sphere with Cold Sphre (flaming sphere that deals cold damage).