Clean unbroken sidewalks are kind of boring. Old sidewalks with cracks and stray bits of things on them are interesting. The banks of the Potomac River has sidewalks with character. They have huge cracks and large chunks of the sidewalks have been washed away. The river sometimes washes over them filling the cracks with water. Small bits from the trees rest on the sidewalks as well.
From this image I get a set of beautiful, subdued mandalas. Little bits of color from the trees stand out against the gray.
See more sidewalk crack mandalas on Ilah’s Mandala Gallery (in the links).