I have applied the stained glass painting technique on a fondant covered cake to great effect using royal icing and edible paint. Need a lot of patience in doing this especially wrapping the fondant on a dummy cake this high and piping the royal icing to create the outline. The rest is mainly shading.
If you want to learn to paint the folk art style on a fondant covered cake ypu can join the workshop that I will be conducting in Seremban on the 7th Sept 2013 (Sat) at Amore E Bake. Please contact the following if you are interested : https://www.facebook.com/pages/Amore-E-Bake/176949952320734