Commercial plant stands, which are usually made from metal, are very sturdy and professional looking, but are also very costly and hard to customize. One way to make a cheap DIY alternative is using PVC pipe. A plant stand or shelf constructed from PVC is strong enough to hold most houseplants, much cheaper than a prefabricated one and can be customized to any size you'd like.
Cut eight pieces of pipe in 48-inch lengths using the hack saw.
Cut eight pieces of pipe to 21 1/16-inch lengths.
Cut eight pieces to 12 3/4-inch lengths.
Cut another eight pieces to 15 1/2-inch lengths.
Cut 16 pieces of pipe to 1 3/8-inch lengths.
Glue PVC tee connectors to both ends of each of the 48-inch lengths so that the middle part of the tee connector is glued to the end of the 48-inch pipe. Make sure that the tee connectors on both ends of each pipe are parallel.
Glue PVC tee connectors to both ends of each of the 21 1/16-inch pipes, again making sure that the connectors are parallel on the ends of each pipe.
Insert one end of the 1 3/8 inch pieces of pipe into one of the free ends of a tee connector attached to the long 48-inch pipes. Then, insert an elbow connector attached to one of the shorter 21 1/16-inch lengths onto the other end. Now you have two sides of a four-sided rectangular shelf frame. Repeat the process to create a full four-sided shelf shelf frame. Construct four shelf frames in this manner.
Use the eight 15 1/2-inch lengths of pipe to connect the bottom two shelf frames via the downward and upward facing tee connectors at each corner.
Use the eight 12 3/4-inch lengths of pipe to connect the bottom two shelf frames via the downward and upward facing tee connectors at each corner.
Drill three holes in each long side and one hole on each short side of each shelf, then drill a corresponding hole on the long and short sides of each piece of plywood. Use a drill bit that is slightly thinner than your wood screws.
Connect the plywood to the top of each shelf with wood screws.