If you don't know what I'm referring to, start reading the code, notice that there are a bunch of weird, non-standard methods that don't seem to be defined anywhere and notice that core classes don't work the way you expect. Then, maybe you'll end up needing to do what I had to, grep the project to find all the monkey patching here: http://github.com/stevenbristol/lovd-by-less/tree/master/ven...
That mostly undocumented plugin, which introduces changes used extensively throughout the app, is not the kind of thing that should be presented to new Rails developers as a good practice.
Aside from the monkey patching, lovd by less does provide some very good examples of how to approach a variety of things in Rails, but the monkey patching is so pervasive that it's unavoidable.