It's time to start prepping for back-to-school time. 

A couple of years ago I did an "Old School" Cookie Collection that contained a milk carton. 
I found the shape on Ecrandal's site and decided it should be featured in this year's collection.

To emphasize dimension on the milk cartons, do each segment separately. 
Changing up the colors in each adjoining segment will make them "pop" even more.
(see photo below)

Dry the cookies overnight.

Use a black food color marker and red food color marker to add some details to the cartons.
(see photo below)