this play time activity is easy to recreate and can be done inside, outside and even in the bath. All you need is kid soap and a muffin/cupcake tray. The soap I used was all ready colored but if you get one that is not try mixing food coloring in to make it colorful. Pour soap into each section and freeze. Once frozen run under warm water quickly to make it easier to get the cubes out. Few of ours melt pretty quick but left behind a soap ice mixture that had a real neat feeling. After some play it was taken into bath time. The bottom left picture was how it looked after most melted. (we used a baking sheet to play with them on) You could also turn this into a color mixing lesson if wanted.
Note~thinking if you add some water into the soap before freezing they would stick longer/melt slower.