My daughter (who just turned 7 today) and two older sons are all on a gluten-free diet. Here are a few things my daughter likes:
-- caramel corn cakes (you can put peanut butter on these, they're great!)
-- apple cinnamon rice cakes
-- sliced apples with peanut butter dip
-- babybel cheeses
-- celery stuffed with laughing cow soft swiss cheese wedges (weird, but she loves it)
-- soft corn tortillas made into sandwiches (La Banderita brand is our favorite -- if you heat them in the microwave a little, fill and roll them in a half sheet of paper towel, they retain the roll up shape perfectly) My daughter likes provolone and mayo; one son likes peanut butter with jelly in a dipping cup, my oldest son likes meat and cheese and mayo
-- raisins and nuts (cashews and pistachios are the preferred)
-- jello
-- cereals that aren't heavy on sugar that my kids eat: Corn and Rice Crunch'ems (like chex) and Gorilla Munch (kix). Sugar cereal: Fruity and Cocoa Pebbles
-- yogurt (gogurt and others)
-- gluten-free bread (I make it in the bread maker) made into toast (awesome stuff, but not as good untoasted, though we're getting used to it.)
-- raw carrots
-- apple sauce (in individual cups)
-- gluten-free chocolate chip banana muffins
-- Brownies, specifically made from Bob's Red Mill gluten-free brownie mix. These are GOOD.
-- Pastato brand Macaroni and Cheese (none of my kids will eat any other brand)
I hope this helps a little. My 15 year old is much more likely to eat anything, but then, he thinks he's starving all the time (his criteria is "Is it disgusting?" if it passes this with a "no" response, he eats it.

) So I listed mostly what my daughter regularly eats.
Good luck! (I put my kids on the gluten-free diet without doing a biopsy at all. They are all much healthier than they've ever been!)