Our fridge doesn't have a metal door, so we can't stick any magnets on it! I do have several of my son's paintings blu-tacked to it though. I love having his drawings up as it makes the kitchen look cosy and homely.
I don't really like anything on the fridge. It gets in the way of cleaning. My daughter has lots of magnets inter alia on her fridge which is white. She has little children and I always think it looks tacky, unclean, particularly in summer. The fridge needs to be clean and easy to clean -after all it is the biggest food container that you have. Use some blutack on the walls for the things that kids bring home from school (full of all that bacteria etc.).
I have just bought a new fridge so am trying to keep it pristine and magnet-free, for the time being anyway. My old fridge, however, had heaps of magnets from travels all round the world. Also had a few magnetised photographs of family and friends.
Yes Vee - went through a big phase of collecting magnets wherever I went, some really interesting ones too from overseas particularly. It was an easy memoir of a holiday and very small to put in your luggage. One of my favourites was "The Alamo" magnet - I was a big western fan when I was young. The problem is getting them off the fridge.Once they have been on for a while they stay stuck hard.