This is what happens when you put recycling in the trash bin.
Instructables user hanlin_y did the math and realized that alkaline batteries are one of the most expensive forms of power that consumers can use. So he/she/it came up with a solution to power your parts even if they don't come with an AC adapter. With a wall plug, wires, and bamboo strips you can run your electronics off the grid; saving money and the environment at the same time.
Last week I issued a challenge to design a book lamp like boutique ones made by Typewriter Boneyard but for a fraction of the cost. Lo and behold, user Richard made a beauty. Using three used books and light fitting parts found at a DIY store, he built this model with two hours of spare time and less than £15. A tip of the hat to you sir for putting together such an impressive (and functioning) model.