Hermès takes a whimsical approach
Hermès emails always stand out. They create these cute sketches, sometimes with a product photo worked into the design. They are simple, a touch of whimsy and one call to action.
Subject line: Give thanks!
Subject line:Lazy days with Hermès
Subject line: Introducing Kelly Calèche, our newest fragrance, on Hermes.com
I like the idea of a cartoon sketch being sent in lieu of a newsletter. As long as you keep your promotion subtle it could work well.