We already have http://flukeout.github.io/ on our prereqs.
In the same vein, how about adding a bit of flexbox: http://flexboxfroggy.com/ together with https://philipwalton.github.io/solved-by-flexbox/?
I know that browser coverage for flexbox is not exactly universal, but if we are going to dissuade people from using CSS frameworks, it might be kind to offer them a nice way to do their grid layout.