What is a good project to learn OpenCL?

A friend of mine, who studies game development at an university, is currently learning programming in OpenCL. What would be a simple project that teaches 开发者_如何学运维the most important aspects of OpenCL and can be finished within about 50 - 100 hours?

I suggest to your friend to implement a paper related to game development so it be will something he could put on his resume too and help him getting a job in this industry.

E.g. this one is interesting and roughly 100 hours of times: http://www.unibas.it/erra/Papers/HiBi09.pdf