One Brown Bunny by Marion Dane Bauer, illustrated by Ivan Bates is one of my dearest titles to use for Spring!
As he looks for a friend, little brown bunny goes from two red birds to ten orange butterflies. Counting and using colors, the watercolor pictures show a soft side to the forest, even if the three black bears do growl, they are adorable.
I'd use this in a group of preschoolers or advise a parent/teacher and child to use it together. It is definitely on my Storytime list for Spring, Bunnies, or Counting/Colors theme.