Thanks for the notes Nathan. It definitely wasn't ideal lighting (office fluorescents plus a bit from the window), so more could certainly be done there. I've never messed with color filtering a flash. I do have a basic add-on flash for this camera that can be used manually or an auto triggered by the main flash, so I'll have to try that.
I don't have a copy of the pic here at work, but I have one that I took with my 35mm (Canon AT-1) of some cave paintings that I did with a long exposure (2 sec IIRC) and waving two flashlights in circles around the target area. I got lucky and it worked out well.