Ideas for big sisters please?

[poppyseed]

Hello again - I haven't posted for ages but I was thinking about you all today and decided that I'd ask you for some ideas! It's DS's 4th birthday coming up soon and he's having a party. We've booked the room and a mini bouncy castle. The thing is that there are about 4 big sisters that I'll have there too and I don't really want them on the castle with the little ones for safety rather than anything else. Have you got any ideas that will keep them occupied for about 50 minutes - colouring competition already covered! The idea being that they can them rejoin the main party at the foody bit, cake etc.
Any ideas gratefully received yet again!

[TinyGang]

How old are they?

That craft catalogue - is it Baker Ross? - have some nice craft type things to make like keyrings/friendship bracelets that type of thing

[Hulababy]

I'd go for craft activities too.

[poppyseed]

OOps, forgot to say - they're 7/8