Seeing as Microchangers appears done and there are still many many characters either unreleased or just not done right... Here is a collection of updated Kreons using mainly Tresob's shapeways 3d printed helmets and my ropey painting and decal skills. Cyclonus, Galvatron (Marvel) and Octane
Grimlock Powerglide Runamuck With Powerglide all I did was switch helmets but I think it totally improves the look.
Cybertron was fun but it was overcrowded and not the best way to display its citizens (population 180 and growing). So I have rebuilt it as something of a cross between a circular layered wedding cake and an oil rig. Will stick up some pictures once its done but at present its covered in white-unpainted Tresob helmets.