concept for cheering up the tube

Here's one of my initial concepts for cheering people up. I'm really enjoying the self initiated project this term. I've spent a week looking into what makes people happy, went around London finding happy people and rode the tube to get insights into how the experience could be improved and made more enjoyable.

I think that the turn styles which are used by everyone could be more creative and interesting. This concept involves each oyster card user having the opportunity to design their own 'oyster face' that appears when they tap their oyster on the reader. The effect being that that with each person that goes through the turn style, a different image would appear. It doesn't have to be limited to just faces - it could be anything.