-Grass is snow
-Real snow has a "lumpy" texture to show it can be gathered
-Leaves are pine needles
-Saplings are a Charlie Brown style small pine tree
-Torches are red lights
-Redstone torches are green lights (deliberate choice because when only using torches, red looks better than green imo)
-Redstone wires are green wires
-Lightstone has a star pattern on it
-Red flowers are poinsettias
-Yellow flowers and red mushrooms are both miniature Christmas trees. This is to allow more freedom for placing them indoors, as flowers require dirt (and light?) but mushrooms can be placed on wood/etc but require a roof tile above them blocking the sun. The mushroom version has a slightly darker star to differentiate the two.
-Cloth is a festive carpet texture
-Leather armor is a Santa suit
-Iron sword is green with a Santa hat hilt
-Chests are gift boxes
-Furnace is a red brick fireplace with garland
-Some art was replaced, there's a wreath, stockings, holly, and a snowman face with buttons
-Cows are badly-textured reindeer. Probably the weak point of the whole pack.
A couple things I discovered while working on this:
-You can place torches on trees while graphics are on Fast, and they won't fall off when switching to Fancy (thanks notsol337!)
-Redstone torches have a bug where the lighting on the tile they're on will be too dark when you load up the game. It looks fine during the day, but the only way to fix it at night is to remove/replace them or switch them off and back on.
-Some of the particles are used in various locations. I removed the flames from the torches, so the tiny flames next to the stove when it's on don't show (but the fire inside does.) Torches also still smoke, because otherwise all smoke/puffs/portal particles/etc would be gone. I don't mind the look of it really, it almost makes up for the lack of blinking lights.
Download:
http://www.mediafire.com/?z07jwqrg1wl6xt1