Springtomize 2 has been updated, and it now seems to work to some extent.
I just have one problem with it. As you can see on the following pictures, some of the reflections of the icons is missing at the bottom, when I use Springtomize instead of Winterboard.
Don't know if I did anything wrong? I created a folder in Library/Application Support/Springtomize/Themes/Dock/ and put two pictures of the dock in there, one named Dock-iPhone.png and the second named Dock-iPhone@ 2x.png.