Wallpapers come in two versions — with and without a calendar — and can be downloaded for free.
with calendar: 1600×1200, 1680×1050, 1680×1200, 1920×1080, 1980×1200, 1920×1440, 2560×1440 without calendar: 1600×1200, 1680×1050, 1680×1200, 1920×1080, 1980×1200, 1920×1440, 2560×1440