DD1 is just 4 and DD2 is almost 3 (but quite young for her age IMO) and I have all the pens etc. in a cupboard with a child-catch on it. There's a table with black paper taped on and some chalks and sponges that they can use any time (because chalk comes off them, the walls, other people etc!) but all the other stuff only comes out when they are supervised.
I'm just wondering whether I'm being a bit uptight (be kind please!) or whether most people do the same with this age group?