E.W.
If you need birthday invitations, I would be happy to make something custom for you with a pumpkin patch theme www.WorksofaWink.com
Instead of a cake you can do pumpkin little pumpkin shaped cakes. All you do is buy the little mini bunt pans, bake two bunt cakes and stack them on top if each other (one face up, one face down). They are really cute, I think there is a picture in the new Family Fun magazine, either that or Parenting magazine. Good luck, it sounds like a lot of fun