hi mate... great idea...
I have several suggestions for you: please make the CL bg lighter cause I can't read the contact's display name, fix CL corners, replace the WL icon of the upper left corner with the tree you putted in the Christmas Messenger image, change toast's bg and change the signing in animation with some christmas bells or something like that
...
with those changes the skin will be lot better
UPDATE: you colorized the PSM arrow but the Display name...