Adding yellow to an annual arrangement or a bed of perennial flowers makes all the other colors shine brighter. Even if you don't prefer the sunshine shade in general, adding just a bit of it enhances the purples, pinks, reds or blues you love.
Nancy Dubrule-Clemente of Natureworks taught my mum and me this trick years ago when we took design classes with her. I have bought a flat of Marigolds each year and tucked them in all my pots and flower beds ever since. They make my favorite color purple sing!
Coreopsis blooms for months and comes back perennially. Add this long-flowering, drought-tolerant, easy-care gem to your beds and keep that spot of sunshine going through late spring, summer and early fall.
Even mother nature knows that yellow in the middle works well. I noticed that many of the flowers I am drawn to in the nursery have a yellow center with another color around the rim. She's so smart.