Quantity   Component name
1 × VoCore mini Wifi router module https://www.indiegogo.com/projects/vocore-a-coin-sized-linux-computer-with-wifi
1 × Rock Choose an aesthetically pleasing rock. For best results, choose a rock that isn't actually a rock.
1 × LiPo battery To replace the AA's in the rock
1 × USB / Solar charging module I don't expect the standard charging circuit inside the rock to be any good, so something from Adafruit or Sparkfun will do here.
1 × Solar Panel - at least 1.5W output In order to continuously operate the rock, the panel needs to generate over 1.5W