When you're shooting macro pictures, a background of a contrasting color can make your pictures look great. Here's a background you already own that can reproduce literally thousands of colors: your computer monitor. The larger, the better. Use image-editing software to create a full screen in almost any color, and then put your close-up subject 2 or 3 inches in front of it. Just watch out for reflections.
— Reader Tip From Geng Li, Brooklyn, NY