- Choose File > Document Setup.
- From the menu at the upper-left of the Document Setup window, do either of the following:
- To change the size of the artboard, choose Artboard, and then set the size and orientation for the artboard.
- To change the color of the artboard, choose Transparency. Select Simulate Colored Paper, click the top color swatch, and select a new color using the Color dialog box.
You can try out this technique But your Changed Background
Doesn't will leave Unaltered the White Fills & Strokes...
So to have a Background where you can Perceive every trace:
- Create a New Layer and Place it Below all others
- Select the Rectangle Tool and Draw a Big Rectangle than cover all your Document
- Fill it whit your desired (Not White:)) Background Color
- Lock your New Layer so it doesn't will Interfere with your work