I have said that inner peace is a physical phenomenon. Start with the physical sensations inside your body and hold your focus there because that's literally what inner peace is (see The Pain-Body label for more articles). And that's good advice.
But we can also look at it another way. As our good friend Eckhart Tolle puts it in A New Earth: Awakening to Your Life's Purpose (Oprah's Book Club, Selection 61),"Being at peace and being who you are, that is, being yourself, are one." (p. 114-115)
What we are trying to get to is feeling like ourselves again, uncluttered by ego and pain-body and any kind of background unhappiness that is common to most of us."