yeah, i've seen plenty of cases where smaller morays are kept with some rather F*^%$KING small fish, grammas, damsels, chromids, aldabrensis dotties, etc...
if your mom want's pretty fish show her some pics of snowflake and zebra eels, i think they're pretty.
you can keep them with dwarf angels, larger clowns, (tomato and marroon) fairy wrasses, larger hawkfish (arc eye and freckled) tilefish, butterflyfish sometimes, foxfaces and rabbitfish, dwarf lions, marine bettas, and maybe certain tangs. most tangs tend to be a little abivolent, but if you can find a nice docile individual it would make a nice addition