Icons – are the visual representation of something in an easily recognizable format.
You need to give only as much form as is necessary to represent the subject.
Essentially you’re trying to sum something up very quickly.
2. Color Themes
Color guide panel will generate few tone shadow colors and few tone highlight colors of each selected colors.
Also will show various types of color harmony (monochromatic, contrasting etc.)
Also, it’s possible to make this to generate cool-warm variations, and muted-vivid.
You can select the colors needed and select them as a color group for swatches panel.
3. Appearance and Graphic Styles
You can change properties of Fill and Stroke, also add additional Fills and Strokes to the object in Appearance panel.
You can save the appearance settings as a graphic style and then easily apply to another object, to make them look the same style immediately.
4. Symbols and 9-slice scaling
You can convert your object into a symbol and use 9-slice scaling to determine the area to stretch the size of the symbol.
Avoiding key elements stretching will help to avoid symbol distortion and will help to scale symbol properly.