I came across this idea on some cool blog (that I now can't find or remember) and thought my kids would love it.
A potion lab, just the thing for a bit of magic, or maybe some scientific experimentation if you prefer.
I saved up any plastic containers I came across for a couple of weeks, then on a sunny but cold Saturday morning away we went. We did this in that time of year when Saturday Auskick had finished but cricket had not yet begun, so Saturdays belonged entirely to us for just a little while. For better or worse.
Many containers, a funnel, food colouring and water.