I can't count how many times a customer has remarked that they'll use their On-the-spot caricature as their 'face book' profile. Especially the iPad caricatures as they're already in digital form.
Not surprising then that quite a few companies have adopted this idea as a better way to portray their staff than the characterless profile photos less enlightened companies use.
Whether it's full body, head and shoulders, colour or mono it has to give a more positive message about your company than the soulless photo booth style photos we've been used to.