I'm sorry to have to tell you this, but: Ideas are everywhere. The problem is that most older methods of "getting ideas" promote looking inward to find them. This is a serious mistake, since the more introverted an artist is, the lower the productive ability is. And if this weren't bad enough, the introvert also tends to get entangled in personal traumas and problems from the past, and the art produced tends to become less interesting to others. A better, but limited, option is looking at others' art for inspiration. This has temporary usefulness, but has the limitation that one loses sight of all the possibilities that do not happen to be present in the art one is being inspired by. The best option from the long-term look is to get inspiration from the real world. The world is so wonderfully complex that even a split-second's view a small place could provide ideas enough for a lifetime. Drill: go out, three steps from your front door, and look around. Write down ten objects that you see. Then go to another person, and ask him to select one of the objects. Make a work based on that object. Drill: with your eyes closed, open the dictionary and point at a word. Then make ten different sketches based on that word. Pick one of the sketches and make a final work of art. Drill: ask three people for the object they like the most and the object they like the least. Make a sketch for a work about each of the items. Make a final work based on the idea you think is the most difficult.
Where to get ideas?