How about paintballing – there is a centre on the way to Penkridge, or a sleepover, I think that’s what I had for my 12th birthday party – maybe gets someone in to do nails or makeup, then snacks and a DVD. There is a driving centre in Seighford that do junior driving experiences – not too sure of costs and age limits though, I do know that the do the Segways things there too. Also you could look at hall hire and a disco – that’s always a winner!