Clever hiding spots for the home. I adore the tub one.
Underground Car Garage by Cardok. Add an underground entrance and I would feel like a fancy rich spy or something every time I put away my car.
"Build Your Own Bat Cave With Secret Room Camouflage" WELL! I'm not going to open all my secret doors with a handle or doorknob!
Drill hole into top of hallow core door. add cigar tube with screw on top. add washer to top of cigar tube. place secret thing into tube. hide in top of door.