Ooo…this one is fun.
https://robohash.org/
actually 4-in-1.
robohash.org/YOURTEXT.png?set=setNUMBER
robohash.org/bob.png?set=set1
robohash.org/bob.png?set=set2
robohash.org/bob.png?set=set3
robohash.org/bob.png?set=set4
