I have 9 yards of pre quilted fabric on one side. What would you do with it?

It would make a cute diaper bag.

What about sleeping bags or play mats for a little girl's birthday party? The guests would take theirs home as a party favor. ???

I never have 9 yds of anything. Why not put bias tape around the edges and make these to give to the Linus Project. I like to piece and quilt my own, so pre quilted fabric I don't buy and I would wonder what to do with it too, Must have been a great deal you got..lol

goodie bags for a birthday party.

Well I am in my late 5? and my grandson is 15 so party bags, I don' think I would be using them. I was told that younger mom do not like the baby loolkng bags. This was from a mother of three little ones.

What a cute nursery outfit. Bedding, bumpers, etc.

the backing for half a dozen little people quilts :)
you could make cute patchwork fronts and tie the quilts, very cute! kids floor play quilts...diaper bags, totes,
how wide is it?

42 inches wide.

I like the idea of binding them and donating several blankies for cancer kids or the Linus project. Beautiful fabric.