shredded chicken, with onions and salsa.

I use the various types of hummus to 'hold' things in so they don't fall out. Also baba ganoush or spiced tomato paste (got that idea from Cava) will do too.
You can add any types of vegetables and meat you like in there. I find that strips are better than cubed so they don't fall out easily even though the corn tortilla would break anyway. We do omelette style eggs because they stay together better in the tortilla. This style eggs is endless on what you can put inside-cheese, veggies, sausages...

Tomato mozzerella and basil

cream cheese

cream cheese and blueberries.

shredded brisket and coleslaw

diced potato and scrambled egg with some pico de gallo

Hummus , red pepper, pickles.

Deli meat. Chicken salad. Tuna. Etc.

Any suggestions? I love the idea of switching to rollups from my usual sandwich on Udi's bread. I am at a loss for fillings though aside from cheese beans and avocado. Any others?