Maker and crafter Timothy Wikander designed this awesome passive amplifying smartphone dock, and gladly shares the full how-to so you can make your own at home.
Timothy says, "Amplifier Dock is a passive amplifier and docking solution for iPhone and iPod touch that utilizes the shape and material of an ordinary ceramic bowl. Designed for disassembly, the ceramic bowl may be reused, steel hardware may be recycled, and hardwood/ wool felt may be left to biodegrade. This is my first project as a 2013 Artist in Residence at Instructables.com."
His instructions suggest a rather equipped woodshop to complete, but that's really not necessary. You can buy milled and square 3/8" wood stock (like maple) at woodworking shops and perhaps even you local home center. You could then just cut the wood with a handsaw, drill, and be good to go.
I regularly use a similar trick to play podcasts while I'm in the shower, but this is, you know, an actual well-designed project that you can place anywhere in your house or office.
Get the full how-to at Instructables: Amplifier Dock