Studio Ghibli Wallpapers/Stitches/Screencaps 1080p+ (UPDATE 2)
http://erfrischungsgetraenk.minus.com/uploads as of 2014-05-24, minus everything in #469262 and #527145 (though there's some updates to existing galleries).
One ZIP per gallery - that way, you can select what you want without downloading the entire thing.
Reencoded the PNGs as 95% JPEG (using sips) because the difference in quality is negligible, while the filesize is about 70% lower.