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MAKE refers us to the best use of a Marlboro pack since, well, its intended one. For under $30, you can build your very own amp, complete with input and headphone jacks, right into your old box of Pall Malls. The guide by Guillermito is very in depth and has some great pictures to get you on your way (it's the classic CMOY amp of DIY yore).

My Marlboro CMOY Amp [Guillermito via MAKE