I've heard of this about MILD. You wake in the middle of the night (WBTB) recall the last dream, and choose a specific dream sign (or the biggest odd thing). Since the memory is still fresh on your mind, you visualize it this time with the added intention of becoming lucid and picture a continuation of that dream scenery.

I've never thought of trying it with a past memory but I do like the sound of having a separate notebook to keep my dream signs and work on them.