I didn't mean to be ultra-mysterious in my last post. It's just that I thought the software program I used (Kai SuperGoo) had been discontinued many years ago. However, a question or two about the program led me to Google it and I discovered that it *may* still be available. Download for All (dl4all.com) appears to have it, but I didn't want to take the time to register as a user in order to learn the details.
The version I have works only on Mac Classic 9 (and yes, I keep a computer around just to have access to my favorite programs from that operating system -- once a nerd, always a nerd!!). It's a two-part program -- Goo and Fusion. Goo lets you smoosh images around. Fusion allows you to build faces, an updated version of those old-fashioned block sets that had eyes, noses, lips, chins, ears, etc. on different blocks that you could rearrange into silly faces. I think the silliness factor was the original reason to buy it. Discovery of the cool Goo filters was an unexpected plus.
So there you have it.