We found these funny looking red and white balls in our neighbor's yard on our walk.  They are the size/feel of a small rubber bouncy ball.  I suspected that it had something to with wasps.  Sure enough, it is an acorn plum gall.  Those devious wasps.

The next day we went for a scavenger hunt for pink, white, and purple crepe myrtle blossoms.  The crepe myrtles are beautiful here this year.  Purple is not pictured here.