This ornament is life size and really can hang on your tree! It is 3D printed and can be painted any way you'd like. You could use glass spray paints, alcohol Inks, craft glass paints or even metallic spray paints would work well. 

The 1:24 Father Christmas is inside this ball ornament as an example, but it deosn't come with the kit. 

Silver or Gold Leaf Paint was used at the top.

This ball ornament is 1 inch round.