If you are doing an activity on prayer reminders, make these easy sock sleep pillows and paint or write in fabric marker, or even sharpie, "Don't forget to pray!" on them.
The girls won't be able to wait to say their prayers so they can go to bed and try them out.
Cute socks like this are almost always available at dollar stores and the rice is super cheap as well!
Here is a picture from Sunburst Yoga head on over to their website for a wonderful kid craft!