Some weeks ago i made a small prototype of Lumines!
Lumines is one of my all-time favorite puzzle games. First appeared on the original PSP as a launch title, it is prolly the game that i played most of all on my PSP.
The clone turned out to be pretty easy to make - granted it has some bugs, and is not as cool as the original, but it was a nice exercise and i learned a lot!
Try it out here:
https://dl.dropboxusercontent.com/u/6176296/BreakDemBlocks/BreakDemBlocksWeb.html