I find inspiration from whatever is around me and the way I happen to be feeling at that particular moment.
There is no hard and fast answer as to "why" or "how" The Muse finds me...it is all about keeping an open mind and listening to your own instincts.
I find that if I read something, or see something on TV, and the subject matter is important to me, it gives me a strong basis for my next piece of writing. For example, I am a member of my local online newspaper, and if I see an article which interests me, I will quite often add my opinions into the "comments" pages. Sometimes, my opinions are welcome, other times it is clear that my opinions differ entirely with those of other people. Whether your ideas and thoughts are in line with those of other people is nowhere near as important as remaining clear and concise and to the point.
Inspiration is a very personal thing. What inspires you as a person may not inspire your partner, your family or someone sitting next to you at work, school or college. The brain is the single most powerful organ of the body, and works differently for every individual. Just because your friend feels inspired by Justin Beiber, for example, you would not be abnormal if you did not feel the same way.
Inspiration is simply an unknown quantity inside of ourselves, in the same way as love. We cannot chase it, we cannot look for it. Inspiration strikes us down, usually when we least expect it.
Good luck with your writing, I hope that helped!