So, my wife think this is odd, but I perfer almost all my food at room temperature. I find tastes are more distinct, and when things are hot, everything blends...
To answer you question, for me, seasoned chicken, tuna, salmon...
For chicken, a good spice rub is 1 tbs cumin, 1 tbs coriander, 1/4 salt, 1/4 pepper. Cumin has a very distinct, smoky flavor, you'll either love it or hate it. If you love it, use it as the primary spice in chilies - amazing.
I sometimes take spinach, and some light balsamic dressing, then add canned tuna. (or the seasoned chicken, tuna, salmon from above)
Here's are a few other things I've come up with
1/2 cup cooked oatmeal
1/2 cup 2% cottage cheese
1/4 cup plain yogurt
1 tbs toasted flax seeds
1/2 tbs splenda (or to taste)
0.3 cup blueberries or blackberries.
(if you want more protein, add half to a whole scoop of vanilla whey)
(can be scaled up or down, I make a batch of 10 cups, then pull it out 1-2 cups at a time (flax can be added just prior to eating to maintain "crunch" and nutty flavour.)
other simple things.
spinach and shredded cheese, rolled into deli turkey/ham/corned beef (eat as many as needed). Watch out for too much sodium. Might be too much like a sandwich without the bread.
one more
1/2 cup mashed sweeet potatoe
1/2 cup cottage cheese
1 tbs toasted flaxseeds
Depends on what you looking for... what are you looking for, high protein, balanced macros, vegan?