I have a more or less complete set of "ressurectionXtras". They are already named accordingly and contain cover, title images, action images etc. Just search for them, but they are quite large!
For the resizing, I used something like "mogrify -resize200 *.png" on the windows 10 linux subsystem. It replaces all images with a 200px version. But I think ImageMagick on windows can do the same thing