Make a home for the lego people.

Who doesn't love a shoebox house. This home took me about five minutes to make. Between trying to cook tea, and keep a toddler busy.
I'm sure you could make a much prettier less rushed one, but today for us, this did the job. We have since added a toilet in the theme of potty training (which is going really well).

What you need. 
One shoebox, bigger is better.
Texters.
Lego men for playing.
I used a little box I already had for the shower, the beds and oven are just left over cardboard from the shoebox lid.