Naughty kids in art club help!

Hi,

I am now running a little art club for 5 year olds at the moment and I'm having difficulty getting them to behave. I've tried shouting above them and just gave myself a sore throat, so the week after I tried bribery with sweets, still didn't work. The head teacher had to come in twice and threaten them to stop running round the classroom and attacking each other. There are some lovely kiddies wanting to do art and a few are spoiling it for them. I don't want to make the naughty ones leave, as they are only five and I'd feel mean. Handy tips and general advice would be most welcome. At the moment I feel like i'm failing with them, I want to make art club fun and don't want to shout at them, as that's not much fun.

Thanks

Jayne x