Hi Sam - I started eating a healthy low GI diet last year and used to make a big bowl of 'salad' based on quinoa (pronounced keen wah)
http://www.google.co.uk/search?hl=en&lr=&defl= en&q=define:Quinoa&sa=X&oi=glossary_definition &ct=title
It looks like little grains similar to couscous but is protein unlike most other grains that are carbohydrate. It cooks up the same as rice. I make a pot of it, cool it, then add anything I have in the fridge eg - olives, vine tomatoes, chopped fennel bulb (delish aniseed flavour) a whole chopped chilli, boiled egg slices, chopped capsicums, pickled onions, drained canned corn kernels, grated carrot, red onion, chopped coriander, drained tuna, smoked salmon pieces, chopped cooked chicken (or any lean meat), cucumber, celery etc etc. In one corner of my lunch container I put cottage cheese topped with chopped dried apricots or prunes and chopped almonds.
To keep it all cold till lunchtime I'd keep it in an insulated lunch bag with small ice packs I kept in the freezer. Not only is this 'salad' delish but very nutritious. I lost quite a few pounds as it kept my blood sugar levels even which stopped me going to the vending machine for chocolate treats!
If you needed carbohydrates you could use wholemeal pita breads and stuff them with the salad mixture. Sometimes I used to add a dressing into the mix, my fav is Brianna's Poppy Seed mix which you can get at Waitrose supermarkets where I also get my quinoa, but you can get this in health food stores too.
Try this, I'm sure you'll love it - Bon Apetit!