Window flower pots can be small enough to sit on a window sill or large enough to hang from the window ledge. You can build either size window flower pot from wood or clay. Build small indoor window flower pots to sit on a wide window sill by using common household objects as molds. Decorate the window flower pots with acrylic paints, mosaic tiles or flat backed cabochons.
Knead a palm-size section of polymer clay by hand to soften it.
Spread a sheet of wax paper over a flat work surface. Throw the softened clay onto the center of the wax paper. Flatten the clay ball with your hand.
Measure the circumference and height of a small can. Soup cans will fit on most window sills, but use a larger can if it will fit on your window sill.
Roll the clay into a thick rectangle with a clay roller. The width of the rectangle should equal the circumference of the can. The rectangle's height should be no taller than the can, but you can make it shorter if you prefer a small flower pot.
Remove the packaging from the outside of the can. Clean and dry the can. Spray the outside of the can with non-stick cooking spray. The cooking spray will act as a release agent when you remove the can from the baked clay.
Wrap the flattened clay rectangle around the can. Smooth the seam where the ends of the clay meet together with your fingers.
Repeat steps 1, 4 and 6 to add another layer to the flower pot. Smooth all of the seams together with your fingers.
Soften and roll out a 2-inch wide strip of clay to fit the circumference of the can. Place the 2-inch wide strip at the top of the clay on the can to make a lip for the flower pot. This will come in handy if you decide to hang the pot in the window. Smooth the strip onto the clay with your fingers.
Soften and roll a section of clay to fit the bottom of the can. Turn the can upside down and place the clay onto the bottom of the can. Smooth the clay into the clay on the can. Puncture three to four small holes into the clay on the bottom of the can to make drainage holes for the flower pot.
Line a baking sheet with tin foil. Bake the clay covered can in the oven according to the manufacturer's directions. After the clay cools, remove the can.
Add one to two layers of clay glaze to the outside and the inside of flower pot. Allow the glaze to dry according to the manufacturer's directions between coats.