Figure out visuals for checkboxes, switches and radios

[snide]

We've had some back and forth about the visuals of checkboxes, switches and radios. Some accept alternate list styling, some don't. Currently we use icons to designate "checked" states, but should probably incorporate color as well.

This is a minor issue for the moment, as we can change it at any time.

cc @cjcenizal, @formgeist, @Adrian-J, @gjones