Try to go out for a walk. It is quite common for an everyday artist to move out in order to find the perfect inspiration to draw. Artists mostly find interesting material to paint when they are walking. Moreover, walking always makes you think less. Just look around and observe other things. Forget about whatever is going on in your life. Just try and absorb the colours, lights, smells and the temperature around you; they’ll all be inspiration enough for you to draw.
You do not necessarily need something extremely raw and original in order to paint it. If there is art gallery, or there are paintings which you like to see, just go through them and get inspired. Sometimes artists like what other artists have done and that’s how they get the inspiration to draw one of their own pieces. It is not exactly copying the idea of someone else, as long as your drawing is not the exact replica of the one which you like a lot.
Try to make an inspirational wall or journal. This really helps artists all around the globe. Whenever you get an idea, and find the time to scribble something, just do it on your journal or your wall. Later on, when you are getting down to do your work for real, just take a look at your journal/wall and they will be inspiration enough for you to draw.
If you think that the ideas are just not floating in then give it time; they will. You are probably forcing everything on your brain and there is a limit to the creativity your brain can withhold. Just try to relax and get your mind off from any artwork. The ideas will soon float in once your mind is fully relaxed.