mmac27, although it may not be clear to people who haven't seen the original, I think you picked an excellent image as your avatar if you use an image program with layer support.
Although what I do isn't quite the type of morphing you mean, I (now) use Photoshop CS(v.
to color and alter (mostly) drawings. I started, briefly, using MS Paint in 1996, but
quickly moved to Photoshop 4 (and later PS6).
What little BE morphing I've done has been of the "shrink the girl" technique, so I can avoid the loss of detail that "liquify" (first available with PS6) may cause. Well, ..OK, I also do it to avoid the learning curve for how to make the morph look good.
..and I rarely do BE morphs anyway, because I'm usually satisfied with the original breast size.
(..as he quickly ducks and runs for speaking sacrilege on the BEA)