How do and where do you (or your colleagues/staff) get your best ideas?

While you are at your desk working? When you are doing something totally different, like cooking dinner? At night in bed, just before you fall asleep?

Do you try to think of things, or do ideas just come to you?

Do you do any formal idea-generation activities, like Synectics?

Sometimes when I 'm stuck for ideas, or I'm stuck on a problem, I get really frustrated and my thought go around in circles. Then when I give up and literally walk away I often come up with the idea I was searching for. Sometimes I have to get right away though, go for a swim or something.