I checked out [this question](https://gardening.stackexchange.com/questions/355/whats-the-best-mulch-material-for-a-vegetable-garden) about what kind of mulch to use around plants. But this year I want to make some extra fancy victory-garden style paths around the places I'd probably just trample anyway in my vegetable garden. 

So, I'm wondering what to avoid. For instance given my [local landscape supplier's stock](http://dvoraklandscape.com/navigation/mulch_landscape.html) what should I not go with (I can already guess chopped up tires is probably not a good one).