Smokebush (Cotinus) is one of the great all-time garden plants, IMO. Easy to grow, hardy (to Zone 4), and gorgeous. The plume-like blooms look great from spring, when they emerge, through much of summer. And the foliage is dynamite. This is purple smokebush (Monrovia’s Royal Purple), which as you can see, has great dark foliage. There’s a chartreuse version as well — Golden Spirit — in addition to more conventional green types.
Other plants come in these light/dark pairs too, which I love to combine for foliage contrast. Garden Debut’s Burgundy Hearts and Rising Sun redbuds, or Spring Meadow’s Black Lace and Sutherland Gold elderberries (Sambucus), are two examples.