Maybe a lot of options for themes. For example: custom button size, custom background images for buttons (separated parts for each buttons: left side, center, right side), editable button position, opacity.
I changed the LIBDIRS line, after that i got this: http://pastebin.com/bgdkbcx6
Then I changed makefile again, I added '-lwiikeyboard' to the LIBS line. Then I got this: http://pastebin.com/k3kCMn6P