I can't seem to find an example, but last year I took some portraits of the family in front of the tree. I used a thyristor auto flash bounced off the ceiling, and used a slow shutter speed to expose for the ambient tree lights without the flash (dragging the shutter.) I was left with the tree properly exposed, with the tree lights just bright enough to show that they were on. The subjects were exposed as well as I could ask from the bounce flash.
I've gotta find that shot at home, and I'll post it later.
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