Looks cool but they are really expensive! Wonder why!!
Just slip them between the pages and stick them to mark the spot you want to return to later. On your shelf it will look like grass is sprouting from your library! This set features THREE packs of Green Markers, each with 75 post-its/page-markers in three different shapes and sizes. With so many at your disposal, if ever the "grass" seems to be growing too big for your shelf you can just simply trim the blades with scissors!
More info: Grass-It Bookmarks