Im about to start childminding and have a ds who is 20 months now. But when he was one we were ....painting(sponge,finger,print etc etc etc), chalk drawing on chalk boards and black paper, crayon drawing, playdough, water play, cornflour and water play, sand and im sure there is more ... we have now moved onto paintbrushes and playdough cutters etc . But there is no reason why a 1 year old cannot do all these things. I dont think there are any products(childrens paint, playdough etc)that would be harmful if injested other than in hugh quantities.
HTH