Color
Warm Color -Warm Colors (related to red, orange, yellow) are advancing colors.
They seem to move forward and suggest activity. They catch your eye.
Cool Colors
Cool Colors (related to blue, violet,
and green) are
receding colors.
They are restful, relaxing, and calm.
Line - gives direction to a design.
Vertical line
Horizontal lines
Diagonal lines
Curved lines
Shape -
is the form of the object.
Texture -is how the design feels or looks on the surface. For example, dots and lines can be used to create a certain surface texture. Or the surface may appear dull or shiny, smooth or rough.
The 4 principles of design provide the guidelines for how to fit the elements of design together in order to create a pleasing design.
Proportion
balance
rHyThM
Emphasis
Proportion – refers to how the size of one part relates to the size of another part of the design. Or how the size of one part relates to the size of the whole item.
Balance – refers to how the elements are arranged horizontally or vertically on the in a design.
Rhythm – is the
feeling of movement in a design created by the use of:
Repetition 
Gradation
Radiation
Emphasis – is the center of interest in a design. It is the first thing your notice when you look at a design. Such as underlined, bolded, or colored words.
Unity
The ultimate goal of the goal of good design is to achieve Unity in the design. Unity is achieved when all parts of a design look as if they belong together.
In other words, when the elements and principals of design
are used effectively, the goal of Unity is achieved.