When you are trying to create art an inspiration would be nice. Nature or music could get you going when you are having a tough time. Try sketching something or decide to learn how to draw horses or cats or cars. Then do it.
Inspiration to a large extent has to come from inside of you. Painting or digital art ideas can be inspired by just playing around with the media and getting loose. It is like writing. Everyone has heard of writer's block. The best way to overcome it is to just start writing whatever comes into your head. It seems to warm up the creative juices. Then you can switch to creating what you really want to create. Loosening up should an inspiration generator.
Great art has been inspired by the Bible and by literature. As an artist, art itself should also inspire you. Take a look at some of your favorite art or go to an art show. One of these ideas should get you revved up to create your masterpiece.