My list for spanking/inpact implements

Baseball bat (Nerf makes a great one)
Belt
Book
Bottom of shoe
Bread/cutting board
Canoe paddle
Cardboard tube
Cookie sheet
Drum sticks
Fishing rod
Fly swatter
Frying pan
Hairbrush (back side)
Hockey stick
Licorice whip
Liter bottle (capped and filled with water or dirt)
Paint stirrers
Phone cord
Plastic/metal food tray
Quarters in a sock or pillow case
Rolled newspaper
Rolling pin
Ruler
Shoe/slipper soles
Spatula
Venetian blind rod
Wet towel
Windshield wiper blades
Wooden dowel
Wooden spoon
Your hand
Xylophone mallet