First let me say that I have some close friends that speak highly of you, and would enjoy meeting you someday.
Regarding the various colored lights, I have read about some of them, including a reference by Edward Victor using colored shadows. Very interesting.
I have heard of the lock-opening effect, but would need to know more specifics (whose routine is it?, do I have permission to perform it?) before I could consider adding it to the shadow routines.
You mention shadow box routines, so I'll quickly tell you what we did with it for 6 years. With a voice over narration, we did the 7 days of creation found in Genesis. "In the beginning, the earth was formless and void" showing the box empty and casually spinning it around in the process. When lights were created, my wife simply sat in the darkened box, and using two squeeze flashlights, squeezing them on and off quickly while moving them around. It really looked like there were 20 or 30 lights in there flashing.
When the plants were created, a shadow of the plant growing was seen, and when the box was opened, there stood a beautiful potted plant (I guess God chose to create that one in a terra cotta pot; another modern miracle).
With the animals, my wife created a slow motion hand shadow of a bird flying, but the shadow faded away as the front of the box was opened (I am deathly allergic to birds, or I would loved to have transformed the shadow into a real bird).
Finally, when people were created, she did a profile shadow of her head, but using her hands to make the hair look "male", she then twisted the shadow to face the opposite direction, and in the process it looked like she "morphed" into a female. When the front was opened, she came out. As the light in the box dimmed, the voice-over simply said, "And on the 7th day, God rested."
It always received a great response from the families that saw it.
As for incorporating it back into the shadow act, I really can't, since I am presenting all of my shows solo now.
Please keep brainstorming ideas for me. It gets my creativity juices stirred, and I know something will be discovered that will be just right for the routine.
Thanks again for your input so far.