A couple of times in my life I have been really lucky to fall into friendships.
Russian class, summer after freshman year of college. I sat across the room from a woman who I just knew would become a good friend. I remember she was wearing a plaid madras jumper on the first day of class. 20 years later, we've been in each other's weddings, seen each other through hard times and good times. 10 years ago, I joked that after our husbands died, we would live together in a house where everything was white, on the beach. (I think I had just seen that Jack Nicholson/Diane Lane movie.) I still think it might happen.
Daycare, after Rose #1 was close to 1 years old. A newly adopted baby came to join the baby room, a beautiful little girl from India. Her mom used to be a lawyer at my firm. Her mom and a few other daycare moms, and their husbands, became a small circle of friends for us while their kids were friends for our kids.
Next door neighbors, a couple years ago. Our kids meshed in with their kids like a pack. There was always someone to play with outside, good for a game of cops and robbers, or girls' club (which consisted mostly of painting nails, in my opinion).
I'm always on the lookout for friends, and hoping to make new ones. Sometimes it's good to remember that many friendships just happen.