I don't have the current version of Phoenix installed yet. I am waiting for xfce 4.8 before I switch from PCLOS Gnome, but you may want to check out a cursor theme called Chameleon. It comes in several colors, including black (called Anthracite), in several different sizes (including large). I use this particular one a lot myself and find it very useful. You should be able to find it in the current repositories, and then you can check out Wonderland after you have installed...
Hope this helps some.