Just going to speak from my own experience, but I really like what you've done here, if it gets you drawing, go with it.
One of the things that has helped me out significantly when it comes to having those moments of not knowing what to do with that blank page in front of me was to just draw something that's in front of me. That chair, that stapler, those trees, one of our cats. Whatever, it's sometimes not the most exciting thing in the world, but that's not the point. The point is to start drawing, and to start to allow my mind to warm up and transfer over from my day to day into the mode of creating. This also happens to be a very good exercise as drawing from life is an outstanding form of practice and you will see a lot of improvement in your abilities from it.
Of course if you want to draw something more imaginative you may need a project or a propt list, or just start turning the things you see into creatures or something. I've kind of solved this by creating a very loose world in my mind that I can visit. It's simply just a forest, an extremely large forest filled with whatever my mind comes up with. The more I've done this the more little creatures, plants and even story ideas I find myself developing out of it. Will it go anywhere? I don't know. But it's fun.