The Gestalt principles I've employed here are proximity and closure.  The proximity of the individual lines draws imaginary lines to where the lines should be connected, and thus perceived as one unit.  We also fill the gaps in where there is space to complete the full letter--closure.

The color scheme I've chosen is a compound scheme, meaning it is a combination of both a harmonious and complementary color scheme.  The light blue and the red-orange lie across from each other on the color-wheel while the shades of blue lie next to the light blue.  The peach color lies next to the red-orange, complementing the darker blues.