Sean Howard, over at www.squidi.net, is making good progress on his goal to come up with 300 unique ideas for game play mechanics. At this point Sean had developed 58. Now, these aren't just one or two sentences like, "Make the blood blue, instead of red.", but are equivalent to full length articles. There are some real nuggets of gold in there. And Sean is nice enough to give them away for nothing more than a mention in your game. If you want to build a game, but can't think of an idea, or you need a little something to spice up an existing game you are working on, check out Three Hundred Mechanics.