That's an excellent way to start. It comes from the same mind and passivily waiting we miss the starting point. By knowing the starting point it gets easier to go into the flow. Win even suggest remembering a dream and the over the wall technique starts with a garden. It's wrong to dismiss an image just because it was a garden we've seen before. We've seen hundreds of gardens in different seasons why did your mind choose that one?
that applies to all remembered scenes. There are many variations why did you remember that one. Probably because it most represents the answer to your question, is the ideal starting point.
Alex