Wanted to work on openscad more so I decided to make a replica Deadmau5 helmet. This is dimensionally accurate to the official specs released by deadmau5 himself. I'd like to be able to stick a LED inside at some point because I think anything can have a LED in it apparently.
With this size you shouldn't need support unless you want since the bottom is flat and should be enough to build on. I have printed the one color completely hollow with no supports in PLA on my reprap and the pictured print is on a makerbot in ABS with 3 perimeters and 10% fill (no support).
Scale up as desired and the openscad file is in mm but the numerical dimensions are in inches from the official dimensions since apparently deadmau5 isn't an engineer.