Deep old school nostalgia:
The 88×31 #GIF Collection
https://cyber.dabamos.de/88×31/
TIL on "Why 88×31?"
"Back in the early days #Geocities offered free hosting if you embedded a small banner into your webpage advertising them. The banner image they provided was 88×31 pixels, and so many Geocities sites would include other external links as 88×31 images so that they matched the dimensions of the mandatory Geocities one…. also going back further the Netscape Now! button was the same size."