http://jsfiddle.net/6HyjZ/
.bookmarkRibbon{ width:0; height:100px; border-right:50px solid blue; border-left:50px solid blue; bord
You already have the shape, just use the transform property to change its angle.
Here is the code that I have added to the code you have.
transform: rotate(270deg);
Here is the fiddle, http://jsfiddle.net/6HyjZ/11/ It now points to the right (unless that's right right side)