What a cute idea!
I used to do that when my kids were small. They loved it (and so did the big kids).
Ghost in a bottle. Saw this on oneprettything.com last year, and made some. Find some small, unusual, clear glass bottles with cork stoppers (Michaels, HobbyLobby, etc.) From interfacing, cut out ghostly shapes, and insert into bottles. You can even draw eyes and mouth on before inserting. They are fun, inexpensive, and conversation starters. = )Cathy M.