When a family leaves my care I will sometimes do a family gift as opposed to just a gift for their child. This could possibly work for you too as it could be a "family date night" idea?

In the summer I like to give a gift basket filled with sundae toppings....cones, sprinkles, sauces, candy etc and attach a cute tag that says " just add ice cream".

Another one I like to do is a gift basket filled with movie treats...popcorn, gummy candy, chocolate, juice etc and than either buy a movie I know they don't have or give a gift certificate for one or even just a gift certificate to a local place that rents movies.