Not only is it useful, it's customizer's heaven. I don't understand it all that well, but I did make the squares smaller and add some color. I didn't figure out how to add the icons as the recently added bookmarks script does. It would be neat if you could do something like automatically add a "recently added" site to the speeddial menu to make it permanent.

Instead of neatly filling the screen, my "recently added" page goes way off the page. I'd rather have it that way and have access to more recently added sites.