How is a Splint Made?
Splints can be quickly made from a wide variety of basic materials. Common splint materials can include: sticks/branches, layers of newspaper or cardboard, cut up pieces of a foam sleeping pad, thin strips of metal, etc. Basically, anything straight and rigid can be used as a splint.
For digits, a couple of standard Popsicle sticks, (or any similar object) wrapped with tape usually does the trick.