Or what if you add a rubber mouse (or what about a cat and mouse together?) to various parts of the house exposed by the nightlight? I agree with Antonio that it's a neat concept.
its a really nice concept what you were looking for here, i really like it, but it would be a lot better if it wasn?t that soft... i?m not an expert on this kind of shots, but i think maybe a slower film like an iso 100 or 50 would have helped... and just another little recomendation, i think that object is not the most attractive for this shot, i?m trying to figure out some other object but nothing comes to my mind, but i hope you find it... its really worth to try it again, as i said, its a great idea, keep shooting!! *smile*