Guitar picks are made out of various polymers today but many interested in music consider celluloid guitar picks a professional's instrument. Celluloid is a thermoplastic developed by Isaiah Hyatt in 1872.
Acrylic is a transparent thermoplastic used in similar ways to glass. For example, car headlights today are made of acrylic.
Keck clips used to hold test tubes together are molded from a thermoplastic called polyacetal. In lab environments, keck clips are invaluable to smooth operations.
Teflon is made primarily from fluoropolymers, a class of thermoplastics with carbon-fluoride bonds. Such bonding makes fluoropolymer products exceptionally resistant to acidic corrosion and require exceptionally high temperatures to melt and re-mold.
The famous plastic shopping bag is made from polypropylene, an early and common thermoplastic.