Seeking out a bash script that would erase them all I found:
find / -name "Thumbs.db" -exec rm '{}' \;
I moded that to this:
find /Users/Dee/Pictures/ -name "Thumbs.db" -exec echo '{}' \;
1) to save time time I changed the starting point from '/' (root) to my '/Pictures' dir.
2) I changed the 'rm' (remove' command to 'echo' to *see* what files and where that it would be targeting - silly I know but some small piece of mind, and I love watching a busy terminal .. yeah I know, "small minds ..."