Depends on how bad the cold is .... if it's not that bad then I'll come in but if it's a really heavy one then I'll try and work from home or in the worse case call in sick.
Had to call in sick the other day for a cold as it was affecting me really badly, something which only happens that bad to me about once every 3 or 4 years, and I hadn't had any real sleep for 2 or 3 days. There was no point in coming in as I wouldn't have got anything done and would have just infected everyone else.
What with VPN and company mobiles I can do most of my job from the sofa if necessary as long as I have my laptop, unfortunately I couldn't that day as I didn't have with me.
I do work with a few people though who you wonder if they are taking the you know what at times ...