Legends tell of a mighty Viking-themed lid designed for a whisky glass. Behold, the Helm of Glencairn!
This is designed to fit a Glencairn glass with a rim of inner-diameter of 42mm and outer-diameter of 46mm. You may wish to scale the model up or down slightly to fit other glasses.
Designed and modelled with Blender, prepared and exported with 3ds Max.