I wanted to create this flexible enclosure prototype which should protect an Arduino board optimally.
The flexible nature of the material has been integrated into design intent from the beginning . Lateral notches have been designed to held some wires. The board itself doesn't need to be screwed into enclosure, there is a snap fit which allows the Arduino to be inserted into the box. The special attachment system can be screwed on a wall, for instance.
I used the downloadable file of an Arduino UNO at http://grabcad.com/library/arduino-uno-reference-design for the renderings.