If you're tired of wholemeal bread, why not try wraps, or bagels?
If you're tired of sandwiches, theres always soup,pasta salad,cous cous salad,salad bowls, baked potatoes.chicken pieces,sushi etc one of my favourites is tuna with mixed beans and red onion.
If you have access to a microwave then leftovers can be really good, stews for example, they taste even better the day after.
If not then take a thermos, you can put various things in it, not just soup, hotdogs and beans, stew, fillings for burritos, macaroni and cheese etc.
If you want to stick with sandwiches, vary your choice of bread,ciabatta, olive bread, foccacia,soda bread etc and salad, different varities of lettuce can make a real difference, also add some other veg, roasted peppers in balsamic vinegar are nice as is avocado..
Also relishes,different types of mayo and dressings can make a big difference.
I've rambled on long enough now, but if you want specific sandwich, salad ideas, let me know your likes and dislikes and I'll see what I can come up with.