Leonardo
Blue
Blue is the color of the sky and sea. It is often associated with depth and stability. It symbolizes trust, loyalty, wisdom, confidence, intelligence, faith, truth, and heaven.
Blue is considered beneficial to the mind and body. It slows human metabolism and produces a calming effect. Blue is strongly associated with tranquility and calmness. In heraldry, blue is used to symbolize piety and sincerity.
You can use blue to promote products and services related to cleanliness (water purification filters, cleaning liquids, vodka), air and sky (airlines, airports, air conditioners), water and sea (sea voyages, mineral water). As opposed to emotionally warm colors like red, orange, and yellow; blue is linked to consciousness and intellect. Use blue to suggest precision when promoting high-tech products.
Blue is a masculine color; according to studies, it is highly accepted among males. Dark blue is associated with depth, expertise, and stability; it is a preferred color for corporate America.
Avoid using blue when promoting food and cooking, because blue suppresses appetite. When used together with warm colors like yellow or red, blue can create high-impact, vibrant designs; for example, blue-yellow-red is a perfect color scheme for a superhero.
Gaze at it to… spur creativity!
Looking at blue inspires more imaginative, out-of-the-box thinking, say Canadian researchers. Since the color triggers anti-anxiety hormones in the brain, you're automatically more relaxed, allowing you to think more creatively.
Wear it to… instill confidence!
Police officers… pilots… military officers… no wonder we're primed to see people wearing blue as leaders. We even think of people in blue as being more intelligent and resourceful.
Light blue is associated with health, healing, tranquility, understanding, and softness.
Dark blue represents knowledge, power, integrity, and seriousness.
I know that blue represents Leo because he has such great leadership skills, even if Raph thinks they can be overrated. Leo has the great frame of mind to be a leader because he takes his duties seriously, he's a great big brother, and his brothers really look up to him, and they feel lost without him if he wasn't there for them. Leo tries to be calm and considerate of others, unless something like the enemy makes him lose his cool, or his hothead brother.
These are about what the colors can represent. And I'll make sure to mention how the turtle fits in with it. But just wanted to say like what colors can mean in more than one shade of color too.