I find that I don't get a lot of uninterrupted time at work, so I try to carve out some for myself by ignoring my phone and email for a while. I used to use it just to get things done, but over the past few months, I've also used it to really think something through. It paid good dividends.
Another way, and I think a better one, is to sit outside on my deck and just look at the woods. It helps to clear my mind and I can spend some real time thinking. The computer, cell phone, etc. are all inside and I can just think something through. As a FTE who works primarily in the office and gets calls after work if there's a crisis, I'm considering taking some half days and working from home where I can do this more frequently. It's relaxing and promotes uninterrupted, clear thought, which leads to more well thought-out ideas and ways to implement them. I know it isn't a scientific approach, but I find that it works for me.