I've recently started a gluten-light diet, I'm having a really hard time going completely gluten-free. I've found I don't like a lot of gluten-free baked products because they seem powdery to me. I as well, am a very picky eater. Even before trying gluten-free I've always stayed away from breads and wheat products and such. I just find they make me feel sick.
My acupuncturist actually sent me to save-on foods. In they're cake mixes, betty crocker has two gluten-free cake mixes that supposedly taste great. Also, this is more snack like than lunch, I tend to carry about gluten free cookies or something, or any other treats that you like, just to keep carbs up. Kinnick Kinnick makes really good gluten-free doughnuts as well.
As far as lunch goes, I've found myself loving cesar salads with no croutons, but with asiago cheese and a sliced up chicken breast. You can prepare the chicken the night before, and just put it on the salad when you make it, or keep it separate and heat it up in the microwave before eating.