You can also coax google images into finding images of a specific size:
https://www.google.com/search?q=imagesize%3A88x31&tbm=isch (88x31)
https://www.google.com/search?q=imagesize%3A32x32&tbm=isch (32x32)
https://www.google.com/search?q=imagesize%3A88x31&tbm=isch (88x31)
https://www.google.com/search?q=imagesize%3A32x32&tbm=isch (32x32)
good to hear that this is still supported albeit hidden