Unfortunately Text Boxes are NOT transparent as of yet.. but you can set it's background color to whatever you'd like (thre last numbers before the font size).. There's a whole lot of code required just to make a text box transparent and I just didn't think the effort and code was worth it..
You should be able to edit any object in the skin editor.. for the phonebooks, just copy this to objects.txt:
/, (P) Phonebook
Phonebook,P,x,y,w,h,forecolor R;RGB,G,B,backcolor R;RGB,G,B,selected color R;RGB,G,B,select color R;RGB,G,B,trs,font size;FONT,font name