What piping gel? I don't see any. Where do you think it's used?
I thought the dark green color was piping gel but, after looking closer i assume it was just dark green buttercream icing? I dont know how they got it so even. it doesnt look like she iced the cake with the light green and then went over the light green with the dark green. Do you know how it was done? Thanks
Unless the top is a green plastic base from the topper, it was indeed iced in light green first, then the light green blocks were piped or spread on (adding texture w/spatula), and finally the dark green was piped into the spaces remaining.
It isn't necessary to ice the cake with any color first... you could ice in white, or omit icing it altogether since the added blocks are thick enough that cake doesn't show through. (only the top surface needs to be iced, unless the blocks are piped on the edge of plastic.)