Dear Diyamondal,
Good to see that you have received many suggestions! But I have a doubt here - going by the ideas posted by a few fellow members - the awards might dampen the spirit and the objective (i.e., of having fun). You can never be sure how the other person will respond to it! Things that are fun for us might hurt the other. Also, these kinds of awards are just based on perception - for example, it might be your perception that this individual is always on the phone (how are you going to quantify it? Won't the person get offended)... You need carefree employees to enjoy this. According to me, even if this works, it might work with young employees, not older or senior ones. I would recommend giving away such awards only when you have a complete understanding of the mindset of all employees.
Rather choose activities that are recreational/fun-filled like having themed days such as Red Day based on colors, appreciation week, or decorating one's cubicle with the least used items, etc. You can find many more ideas on this site itself.