FYI you can still access these options (and more) with the Google Advanced Image Search: https://www.google.com/advanced_image_search https://www.google.com/adv

FYI you can still access these options (and more) with the Google Advanced Image Search: https://www.google.com/advanced_image_search https://www.google.com/advanced_image_search edit: Oh, it no longer has "custom" under the sizes. Hmm.