Visualizing things richly and colorfully leads to more creative thinking. You probably visualize things more than you realize, without really thinking about it. So you already have some visual thinking skills. But how do you become better at visualizing things on purpose?
Try this:

Go to a hardware store or someplace that sells paint. First, pick a paint sample color card that matches your shirt. That's a warm-up, starting with something very concrete and right in front of you — your shirt.

Then, look for a paint sample color card that matches something at home. It could be a different shirt, a piece of furniture, your walls. Whatever you choose, you will need to picture it very clearly in your mind so you can "see" the color.

Paint sample cards are usually free, so you can take home the ones you think are the closest and see how well you did. The more you practice, the better you get!

Check out One Squiggly Line's About Visual Thinking page to learn more.