Although Dagmar and Kevin Sullivan’s colonial home in Kennebunk features a traditional exterior (painted in Sherwin-Williams’s Flagstone) that remains largely unchanged from when it was built 16 years ago, the interior is modern and Scandinavian-style, thanks to a major remodel by Graham Architects and Spang Builders. The garden is all Dagmar’s work and has shade-friendly plants such as hostas, azaleas, rhododendrons, Solomon’s seal, hellebores, and hydrangeas.