Hellobee Boards

Have you tried Pinterest? I think something with fall leaves would be fun.

You could make fall trees- ahead of time either draw or cut out tree trunks with bare branches, supply fall colored tissue cut into strips. The kids then rip the strips into pieces, crumple and glue on the tree. You would probably need an adult or two on glue stick duty but it's a fun project. I have even done a huge one made out of craft paper that several kids can work on at once, you could make little stations and have that be one of them so you don't have a slew of toddlers all painting pumpkins at once or do it as an arrival activity.

Somehow I missed that there would be older kids too, I have done this activity with kids as old as ten before and they still loved it, plus then they can be on glue duty!

@Cole: that's super cute!

Painting pumpkins
Painting with apples(isn't that the theme)
Have trees already drawn and have them glue on the leaves/apples