Pinterest is the best platform that I always visit to get ideas from because there are so many creative things that you can see on that platform. If you know how to tap into them, you will be able to get so many ideas that you can use to do your graphic work.
I always visit the park near my place whenever I want to run some designs. The environment is calm, and that has been a very good place. I also get inspiration when I am taking a walk, although that is not always frequent.