I did this activity many moons ago when Logan was a baby. I actually believe that it was one of his first arts and craft experiences. I decided to revisit again as the weather started turning nicer these past couple of days.
First I filled up an empty icecube tray. I used washable kid's paint in some and food coloring in others. (Just remember: that food coloring sometimes stains skin, so I wouldn't recommend you use this unless you don't mind some extra scrubbing). Then I filled it with water.
The first time around, I didn't use straws. It was a hot summer day and I wanted it to be more of a sensory experience. This time since little hands get cold, I added the straws. He still managed to find a way to get paint all over his hands.
I like this activity because it is an open ended activity.
Which he did.