I get ideas in the middle of writing about how to get ideas. The simple act of walking down the path of writing about new ideas makes new ideas come into being.
Drawing and writing is even better. Then you are using both sides of your brain. Drite (Draw Write) your old ideas and problems and look at them upside down. Sounds funny but you would be surprised how useful this is for getting cobwebs out of your brain. Drite old cobwebs and watch them turn into a tapestry. Have fun with it. Relax to solve problems. Have a wacky Wednesday and do everything wrong and see what happens.