Ok, as it's 'do nothing at work day' or 'Leap year' as it's officially known... I was looking for some creative ideas and found this. I particularly like the Computer Doctors logo, simple but effective. http://www.boredpanda.com/worst-logo-fails-ever/
Wang Computers (big in the 80's in the US), When they moved into the British Market couldn't work out why their slogan didn't take off, it was Wang Cares
The most famous one was Microsoft, (you may have hear of them, but I think they only have a few pounds to spend on marketing)... They set up a site for their email program Exchange, it was www.msexchange.com