I'm trying to think of what I make in a slow cooker that doesn't use tomatoes....  I may have to pull out my recipe box to look....

All-Recipes.com used to have a feature that you could select an ingredient, and then "x" it, and it would bring up recipes that don't include that ingredient.  I am not finding that feature right now. However, All Recipes has a section for slow cooker recipes.  Maybe you want to scroll thru it, see what looks good, and go from there.

Taste of Home has a section for slow cooker recipes.

Food Network has a section for slow cooker recipes.

If I were in your shoes, I would scroll thru these, and see if I can find one or a couple of these that look interesting, interesting enough to try.