Ahh, someone else who likes "artsy" anime
anthologies!  Unfortunately, cels from all
three of those films appear to be quite rare
these days.  I've seen a few from Robot Carnival
in galleries, but I don't think I've ever seen
a cel from Manie-Manie or Memories.  A cel
of the robot girl from "Presence" or the 
telekinetic race car driver in "Running Man"
would certainly be cool, though.

At least I am able to find cels from my favorite
anime "art" film, Angel's Egg, from time to time.