I've been dealing with this problem for about three weeks now. I've read so many articles on The Escapist, Gamasutra and books about game design that I wasn't able to come up with a fresh idea anymore.
Take a break from the articles. They're obviously cluttering your head too much. You can always read more of them when you have a basic idea for your game and reshape your concept to the things you read and find interesting.
Try not to think about games too much. Focus on other things and make sure that you have a notebook with you at all times. A lot of people come up with their best idea's when they're doing something else. (I tend to come up with a lot of things when I'm on a train ride)
Think about what inspired you in the past. I get inspired by movies and great storytelling. Last night I've watched Inception (which made me think of the Matrix and the Animatrix) and I came up with a few basic concepts that I might work out into a game.
Write down every idea that pops into your head. This way you will not forget idea's and more importantly, idea's that you don't like don't pop up all the time. You've written them down, so you don't have to think about them all the time.
Try to brainstorm with your programmer. Write everything you two come up with down on a piece of paper. And remember that not a single idea is a bad idea. When you come up with a 'bad' idea, he might get inspired and think of something awesome. (There is a lot of information about brainstorming, try to find some articles).
You can always post some idea's on this forum. We can give you feedback and maybe send you in the right direction.
Oh and one more thing: When you think of something that might be fun, just prototype it and show it to others. Don't think about the story, the graphics, sound etc. Just the basic mechanics. Construct is an awesome platform to do this with.