Place the sponge cakes on a cutting board
Cut each one to varying heights, I cut some in 1/2, some I took of just a 1/4 and others I barely took any off of at all, to give them all personality.
Once cut to size, take the writing gel and decide if the minion will have one goggle or 2 and then decorate accordingly. Do not GOP the writing gel, just enough to make it shown
Take a Mini Marshmallow, dot it with black writing gel and place in the middle of the goggles to create a 3D eye effect and it is an eyeball.
Finish each minion one by one as many as you want to adorn your cake
Go around each placed minion with thicker blue decorating icing, forming a ring around each(it's their suspenders)
That is what they look like complete and that is what your cake looks like completed it is a 3D Minion Cake