To create an improvised image template for nail art stamping, you will need a plastic sliding folder, a pair of scissors or cutter, and a pencil. First, you should sketch your desired design on the plastic folder using the pencil. It is recommended to keep your design simple, as intricate designs may be difficult to cut out and stamp cleanly. Once you have your design sketched out, use the scissors or cutter to carefully cut out the design from the plastic folder, creating a stencil. To use the stencil for stamping, apply nail polish to your nails and let it dry completely. Then, place the stencil over your nail and apply a contrasting color of nail polish over the stencil. Use a scraper to remove any excess polish, and then lift the stencil off of your nail to reveal your stamped design. With this improvised image template, you can easily create unique and professional-looking nail art designs at home.