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I messed with the TfL APIs a little bit, they're pretty good. But that was more of a software development exercise when I was job hunting: http://rjw-tfl-bikes.herokuapp.com/ (this just plots the locations of bicycle hire on a map). Fine, I'll have another look. Maybe the fact that I can share it on here will motivate me... I didn't know the name either, just seen them referred to with regard to Tufte.
I also had some fun with the TfL API, mostly to get my foot in the water regarding GET requests / REST services / XML. Try to find a big spreadsheet and try to prove/disptove a hypothesis, or visualize the data in a new way. Here, check this out. Let me know what you come up with! :)