The best advice I can give you is this: don’t overcomplicate it!
For example, one of our students was in the Starbucks drive thru and noticed a bumper sticker on the car in front of her. She went home and created a simple, text-based design of the phrase. Slapped it on a mug and listed it. The next day, she made her first sale. Easy peezy.
Remember: ideas are all around you. If you can’t think of anything, start searching funny memes or quotes. Pinterest has a load of ideas!
The best part is that once you find a great phrase, you can recycle it for multiple niches. For example, the popular phrase, “world’s most OKAYEST mom” has been replicated a number of times to suit various niches. You can easily replace mom with daughter, father, teacher or even dog trainer. All of a sudden, you’ve just brainstormed 100+ designs from a single phrase!