Black: People who choose black as their colors are often artistic and sensitive. While these people aren't introverts, they are careful with the details of their lives and do not share easily with others.
White: People who like white are often organized and logical and don't have a great deal of clutter in their lives.
Red: Those who love red live life to the fullest and are tenacious and determined in their endeavors.
Blue: If blue is your favorite color you love harmony, are reliable, sensitive and always make an effort to think of others. You like to keep thinks clean and tidy and feel that stability is the most important aspect in life.
Green: Those who love the color of green are often affectionate, loyal and frank. Green lovers are also aware of what others think of them and consider their reputation very important.
Yellow: You enjoy learning and sharing your knowledge with others. Finding happiness comes easy to you and others would compare you to sunshine.
Purple: You are artistic and unique. You have a great respect for people, but at times can be arrogant.
Brown: You are a good friend and try your hardest to be reliable and dependable. Flashy objects are not something you desire; you just want a stable life.
So this may be why you pick greens, blues, blacks, etc in your projects. :)