If you have sandwiches, have you tried adding salad to it?
I can't stand raw tomatoes, cucumber or radishes, and up until being diagnosed with diabetes, I wouldn't have even dreamed of thinking about adding things like that to my lunchtime sarnies. And lettuce? SO DULL!!!!
At least that's what I used to think. Still can't stand cucumbers, radishes, tomatoes, but I have found lettuce greens that are actually quite tasty.
There are a number of prepackaged salad bags out there that taste really nice. Baby lamb lettuce, spinach leaves and similar are quite mild but do taste nice. Or, if you prefer something with a bit more of a kick, there's rocket, watercress and wasabi leaves. The Naked range has a lot to choose from (and they provide a mild to spicy chart on the side), or you can look at the supermarket's own brand. Other than washing, you don't need to do any food preparation with them
Another thing you might want to look at is celery. It is easy to chop and adds a nice flavour to my ham sarnies. If you don't fancy cutting it up, I think you can buy it pre-cut.