How about my viking helm in [ Free Stuff](http://www.renderosity.com/freestuff.ez?Topsectionid=0&Form.SortOrder=UserName&Start=17&Form.Contrib=Little_Dragon)? The flaps and spectacles have separate material groups, which you can make transparent, leaving only the dome.

The studs have spike morphs.

The bands and studs also have their own material groups, so you can eliminate them completely, if you wish.