For hobbyists at least, Dangerous Prototypes and others promote the "Sick of Beige" family of form factors. http://dangerousprototypes.com/docs/Sick_of_Beige_st

For hobbyists at least, Dangerous Prototypes and others promote the "Sick of Beige" family of form factors. http://dangerousprototypes.com/docs/Sick_of_Beige_standard_PCB_sizes_v1.0 http://dangerousprototypes.com/docs/Sick_of_Beige_standard_P... Sadly there don't seem to be many cases other than the laser cut ones on Seeed Studio.