I'll tell you what we teach our kids in our church youth group -- it's just a basic box, (slow, quick, quick).
A box step is common to waltz (1,2,3, 4,5,6), foxtrot, rumba and samba, maybe others.
The nice thing is, we teach a simple box to 4/4 music, teach them how to turn it and how to go forward (go forward on second half instead of back).
It may not be classic ballroom, and I don't worry about a lot of technique, but it gets people dancing, and even a box step in closed position is impressive if the rest of the people at the dance don't know anything about dance.
The nice thing is that in an hour or so, we can have people doing something besides the 'bearhug', or 'penguin'.
The one exception I have on teach technique, is that I make sure to teach dance position and connection. Can't dance without it.