Ideas Suck
When we are looking for inspiration, we have already started working on something and are basically looking for help to get us where we want to go. Sometimes it's good to open ourselves to discovery and mystery and see where it gets us.
Starting with an idea means that the doors of possibility close. Once you choose the idea then you focus on delivering to that idea and disregard any other possibility that might come up. What I've found very useful is opening up to discovery and mystery, and allowing it to get you to different places.
Move your idea to areas that feel uncomfortable and challenge yourself. It will re-open the possibilities and let you challenge your idea. If the idea is good it will stand the challenge, if it doesn't then you can change it.