Open up the hypershade and then type in
in the command line. Link the rayswitch node to the diffuse and link the diffuse texture to the "eye ray" slot in the rayswitch. Then change the Photon or Final Gather color to whatever you want bouncing around. Most of the stuff in that Jeff Patton tut applies.
Like Toast says, you generally don't wanna have values above 217 / .85 when using indirect illumination schemes, or things start looking weird.