Vibrant and showy mophead hydrangeas shine in arrangements from rustic to the most formal. Here we see their giant, variegated blossoms layered with complementary delphinium spikes echoing the adjacent painting’s abstract splatter. Punctuated by green viburnum pom poms and anchored in a substantial cast-iron vessel, this high-summer composition is a study in the crisp, cool end of the ROYGBIV spectrum.

Arrangement created by and available through M on the Square, 259 Market Square, Lake Forest, 847-604-4255, monthesquare.com.