You can create a flexible, articulated snake using simple household materials:

: Tubes provide excellent "burrow-like" hiding spots for smaller species like garter snakes .

Cut several cardboard tubes into equal-sized sections (rings). Paint the rings in your desired "snake skin" pattern.

: Cardboard is porous and can harbor bacteria if it gets wet or soiled; it should be replaced frequently during cleaning. Stipple Shading Tattoo Illustration Photoshop Tutorial

For actual pet snakes, cardboard tubes (like those from paper towels) are often used as cheap, disposable enrichment: