Thought you guys might be interested - it is on my site: http://www.bacman.co.uk/home/keyfobs/ the thread for entries, etc is http://www.bacman.co.uk/home/forum/ (look under "Competition" section)
They are called keyfobs, keyrings or keychains; do a Google image search on those three references and they all show the same things - something you attach to your keys (car keys, house keys, etc). In the UK we normally call these things "keyfobs". I have a Mario face keyfob on my keys; they are fun, and also make locating your keys easy too.
I now see where they are called that; just never heard of that usage over here. When we hear keyfob, we think of something with a battery in it used for secure access to something.