Myself and my wife made this (pretty awesome) cake for my daughter's 1st birthday. Remembering one of Clive's lighting tips I positioned a desk lamp (the sole light source) off to the left, spot metered and you can see the effect:
And with a small reflector on the right to lift the shadows:
And, for comparison, here's with the flash
and with all the lights on (WB unadjusted):
I thought the comparisons would be useful to illustrate how a simple lighting setup (1xdesk lamp, 1xwhite reflector) can work.