Hmm, that's a difficult question... I tend to believe that not everything that happens has a logical answer, I don't really have any examlpes per sé but I do believe miracles can happen ^^; but I guess I just think that way because I believe in external forces.

I just think of any thing that could not happen as of a little miracle. A train comes to the station at the same time with you, a lightlamp turns on as you pass by or even the weather is nice - "it's a miracle)!"
Then it's easy to notice some larger things you can call miracle. For example you walk on an old friend you haven't seen for long time just as you thought of him... Life just begins to be a little more positive.
And of course it's allways pleasant to do things others can think of as a miracle. For example once I had to get rid of a rose that... well... was unappropriate at the situation. I managed to attach it o strangers bag unnoticed. I think it was positive for both of us. Or participating in a flashmob of blowing soap bubbles over Red Square...
I hope that more "miracles" you give - the more actual ones you recieve)...