BigTom on the no wet food thing. I make mexican style seitan wraps quite often. Its just frying off the seitan in spices (cumin and smoked paprika). I usually add mushrooms and peppers but you can sub them for any other veggies you prefer. Then I chop up fresh tomatoes, chilli, coriander, garlic, ginger, spring onion and add a squeeze of lime and black beans give it a stir and add that mixture and the seitan mixture to a toasted wrap, possibly with cheese.
Again you can sub in other ingredients if there's stuff you don't like. It takes about 20 minutes tops including the prep. Oh I normally have either chipotle or habanero sauce at home so I add a bit of that to the seitan mixture while cooking and again to wrap once it's all in there.