My DD is gluten free also, and that does indeed present special challenges. Next year her lunch will have to be dairy/vegetarian too, since she'll be attending a Jewish preschool.
I'm big on bento boxes this year. I got some mickey head food storage containers from the
disney store and I send one or two of them (connected with an elastic band if I send two).
In one ear I put a cupcake paper filled with veggies (cucumber slices, baby carrots, whatever she's eating that week). In the center I put the entree (mac and cheese, noodles with butter and canned cheese, egg white quarters, cheese sandwich, fruit and peanut butter, etc). In the other ear I put dip or a fruit dessert. Sometimes I send yogurt or little dip containers seperately.
Once in awhile the entree is veggie sticks with hummus or similar. Then I'll put fruit in one ear and veggies in the other. Hummus and some corn chips in the middle.
Rice in the center, scrambled egg in one ear, fruit in another ear and some ketchup for dip.
Cheese sticks cut into shapes in the center, veggie shapes in one ear, rice crispy mickey in the second ear.
I usually send a shelf-stable milk along too.
If I'm sending snack that's in a seperate mickey head. Mickey-shaped apple slices with peanut butter
buttered waffle or pancake with syrup for dipping
cheese quesadilla
bananas monkey-style