Allow her to choose paint color from three shades of beige (gives her a little control).

Size and color?

Change light fixtures, accent walls with pops of paint color / board baton wall or two, updated decor. 

Make your sure liability and fire insurance is current.Woww, thank you for confirming why I need to sell everything in CA and invest in more landlord friendly states, we all know what color states those are.

Don't use colored ones, not as strong. 

If they decide to paint the walls, they should paint them back to the original color before leaving, or ask you for permission to leave it as is.

Never judge a book by its color.

Probably the trim color. 

The difference is I worked for a small city (less than 50K people) and you work for a REAL fire department—I grew up watching squad 51 and engine 51 on my tiny four-channel color TV, LOL.  

Meyers fla and Lehigh acres and coral gables between the two of those there was almost 1 million lots created in the 50's and they have been sold cheapie over the years.Oh the good ole days...