How about a homemade solar cooker made lout of a cardboard box & aluminum foil.
see: http://solarcooking.org/plans/
Smart little gadget uses Solar and Wind energy to charge 2 batteries within the gadget which an later be used to charge your gadgets.
Duration : 0:1:37

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.

It's hot. It's cool. It's one nifty gadget that helps you keep your cool when temperatures climb. Our Solar Hat Fan simply clamps on to your favorite hat (stiffer-type brims and baseball caps are recommended), then the mini-photovoltaic panel harvests enough solar energy to directly power the fan. Features an adjustable mount. China.