I read somewhere about an exercise where we needed to focus on seeing subjects within 15 feet of our bed. So on a rainy day it seemed as good a day as any and we had nice diffused light. There was more to see but three images is enough to bore you.
This exercise could also be an ongoing project. Just thinking, yes I know that’s dangerous, that maybe setting aside one day a month or a week and look around my room to see what presents itself.