This is a 3D printable case design for the smallest Arduino Pro Mini. There is space for a rechargeable 3.7V 150mAh Li Poly battery (also UK supplier) and a sensor. Holes are provided for reset, led viewing and additional sensors and cables. Battery should last several days before recharging dependant on application.
3D printable version here from Shapeways
This case can be printed, but is not tested yet, expected mid August 2012.
Case design by Lyndsay Williams Sensecam@gmail.com