Exercise your imagination.

Stimulate your mind to activate your imaginations, and begin using them by coming up with new ideas. Soon enough, you’ll hit a goldmine.

Instructions

What synthetic imagination is.
Your synthetic imagination arranges your old concepts, ideas, and plans into new combinations.
What creative imagination is.
Your creative imagination works off of hunches and inspirations to create new ideas.
Exercise them!
Both types of imagination become strong only through frequent use. To exercise them, look for unique, yet simple, solutions to problems. For example, if you are a publisher and you notice that one of your books is not selling well, a unique and simple solution would be to change the title of the book to something more attention-grabbing.