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I notice that Canon G7, as well as a few other Canon compact digital
models has this feature, which can be set before a photo is taken.
With color accent, you can choose one color only to be present in the
image, while the other colors will be in B&W. Does Nikon compact
(P5000, etc), or Lumix (FZ7, FZ50, etc) has this feature? Any more
expensive DSLR cameras have this feature? perhaps in some Canon DSLR?
I believe that you can also create this effect afterwards in a
software, but the built-in feature in Canon compact would be much
more convenient.
Thanks for info.

Yes, other manufacturer's cameras also offer rather useless features,
frequently in the "scene mode" menu.
If the G7 permitted to store pictures in raw format, that might allow to
salvage otherwise pretty bad shots in post processing. This "color accent"
option allows to make sure a shot's results are fully useless even when post
processing is applied. Also the options for color to black and white
conversion are limited that way. To take useless, tasteless ugly pictures I
would personally prefer a cheaper model than the G7, but that is perhaps
just my personal taste. My suggestion is to shoot in normal color mode. At
least when using any decent image editing program (including Canon Arc Soft
Studio), post processing on a PC offers much more flexibility to "uglyfy"
your digital photos.