Dear tsuwm: while looking for something else, I ran into this list of unusual, essentially worthless words, no definitions. Perhaps if you haven't already seen it, you might find something you could use in it.
Any of the rest of you eager beavers can see if you can find definitions for them.

http://www.selfpromotion.com/domains/words/len/6.txt

bill, I tried backing up a directory to learn more about this list (it almost looks like a list of possible Scrabble® words), but that didn't work. I was able to substitute for the number at the end and get (e.g.) 5- and 7-letter lists.