Existing plastic products such as extruded waste-water pipe can be called into service and useful cases created.  Two projects that use this casing that are featured within this site are the
'water detector' and the 'steady hand game'.  The end caps for the product are small injection moulded wheels from the TEP catalogue.

Acrylic shapes and vacuum forming provide the most easily adaptable of making custom shaped cases for elctronic products.
An alternative design for the water 'water detector' detector circuit is shown here.