I don't want to go to the trouble of erasing all the ornaments, but there'll be a 3rd block with just the ornaments and the present in the mouse's hands.
Ok, here's the bw version minus the tree:
I can make a stencil mask for the tree when printing the window, then mask the window when printing the ornaments. A second block can be the tree minus the ornaments.
Working on block size now. Has to match well with the required card size.