This coloring page depicts the Capitol Building, one of the most iconic monuments in the United States. Its clean and symmetrical lines are perfectly balanced, and its prominent dome provides the perfect contrast against the blue sky. I suggest using a light, creamy yellow for the Capitol's walls and columns, to represent its unique color and texture. Add some subtle touches of green around the building to suggest the surrounding lawn, and also add some playful pops of color to liven up the scene. A mid-tone blue for the sky, and a bright green for the trees would create a vibrant yet calming environment. If you really want to add a little bit of whimsy, use a lighter shade of the same green for the shrubbery, with a little bit of yellow and white here and there.