Take a colored foam and cut it to a bookmark shape. Mostly the bookmarks are tall rectangles. Decorate the foam bookmark using markers. Now design it for looking more beautiful. Use stickers to add additional decoration. Collect stickers from a craft store that offers a large variety of scrapbooking stickers. Cut the foam sheet and be sure to get along with the theme of the bookmark. For example, if a child drew horses on his bookmark, cut out horseshoe. Decorate the cut-out if necessary. Add glue to paste the foam cut-out to the top of the bookmark making sure that this part will stick out of the top of the book. Let it dry before using it.