Colors have meanings. This is why we typically don't tend to paint our bedrooms bright red. And why we use terms such as "wide blue yonder" and "green with envy." It's also why you are drawn to certain colors some days and others on other days.
Spring sprang to life with color after color after color, and it brought me out of my winter slumber almost instantly. Now the foliage is at full force in a shiny, new green that will hang on until fall...and I love it.
Green is the color of hope. It lands in the middle of the color spectrum, marrying the warm (yellow) with the cool (blue), and therefore represents balance. It's the color of newness (hence the term -- "he's green at the job") and new beginnings. It can calm and energize simultaneously. It's the color of healthy growth, and healing in general. It's also the color of the heart chakra, so it relates to love. Green also symbolizes abundance -- it's no accident that our money is a shade of green.
Eat greens. Sit in a green field. Imagine green light around you. Doing any and all of these will facilitate balance, health, and opportunities in your life.