This is by far my favorite thing to color and use for sensory play with my kids.
To color epsom salt just add little bit of water and food coloring. (we used gel food coloring)
Let dry and its ready for play. (I found if it sits in the sun it drys way faster..way way faster)
It is brightly colored and has a very cool feeling.
We made this bin with barbie babies but really you can make it for any theme. This one would be good if you have a growing family. It is a easy way to take about new babies with little ones. :)