I am probably posting on the blog after 2 years or so. Sorry for the delay. I hope I would be able to re-run the blog more frequently once I get into a college.
The following scroll to top widget is sleak, clean elegant and super easy to add in your blog. The best part is that you can add any other icon you want.
You can see the live demo on this page itself. To see it in action scroll down the page and hover/click over the rocket.