Something that will last about half an hour.
We have done slime and shaving foam, was thinking about something food related like baked beans or custard? Just getting them playing with food basically! But then not really sure where to go from there. Just give them bowls of different stuff and let them get on with it? Or use smaller bowls so they can mix it all up and gross each other out?
Urgh. Feel like I am not getting anywhere with this idea and that it needs more of a point, because off all the EFYS etc but surely messy play is just that?