Silvia at Homeschooling in a bilingual home sent the kids a few bookmarks. She made them by decorating a piece of thin cardboard with pages from old books, maps and greeting cards. I thought they were very creative. My five year old immediately created another one after receiving the gift. Her's is the one covered in pink paper and decorated with stars.
That wasn't the end to the bookmark creating. My eleven year old used some junk mail from the stamp dealers to create these awesome bookmarks. Both my daughter and Silvia said the key is to use a glue stick. That way the paper is nice and smooth.