My kids love Fruit Leathers. They're just dried smushed fruit (no sugars added) but they like them the same as those all sugar "fruit gushers" type of things. They love mixed snacks - when I throw a bunch of different things in a baggie. Kinda like a make your own trailmix. I like that I control what goes in. My kids also think golden raisins are a special treat.
The other thing is to make the food into special shapes. Put cream cheese on 3 ritz crackers and arrange them on a plate like a snowman. Then you put raisins for the face and pretzel arms if you've got them. We also make peanut butter sandwhiches and I use a cookie cutter to make them into shapes. That's a big hit as well. As long as the food is fun, my kids will eat anything healthy.