Big, puffy clouds add a lot to the background of a photo. A cloud-filled sky can make the difference between a good photo and a memorable one.

When the skies over Petaluma fill with cumulus clouds, it’s time to take out the camera and make some pictures.

My favorite place to fill a photo with clouds is the top floor of the parking garage in the Theater District and that is where I went yesterday.

An unexpected photo op presented itself while I was up on the roof. Down below, C and 2^nd streets were filled with costumed kids and their parents, grandparents and other assorted adults. Here are some of them.