The best way to remember the 50 anniversary, the colleague is a funny caricature.
In caricature I can add fun details, either the person's hobbies or profession. The picture is certainly a memorable gift to give and receive. 50 year old guy certainly has all the stuff he need and the group purchased microwave oven is not very personal gift anyway.
Maybe yours next gift is a little more personal. If the idea seems to be appropriate, visit my portfolio and place your order!