Hi,
I agree with those posters who suggest the mini cool bag and ice packs; I am often out and about at work all day and this keeps everything fresh till lunchtime even in a hot car.
Some food I take as well as couscous and pasta are cold quorn sausages with homemade syn-free salsa dip, boiled eggs, homemade three bean salad, wedges of spanish tortilla, potato salad, Asda pitta stuffed with homemade coleslaw/houmous (Hex B or synned) & roasted veg/ homemade spicy bean pate and salad etc. I also like to make SW rice pud and eat it cold! In the winter I make soups and take them in a flask - carrot and coriander, chunky vegetable, spicy lentil...the list is endless.
Another trick is to cook a little extra for the evening meal the night before and heat up some of this to take in a food flask; I tend to take things like quorn chilli, quorn jalfrezi curry, roast veg lasagne....whatever there is left over really.
As I'm a veggie, all of these are veggie/green day suggestiones, but I'm sure you could adapt them to the other plans.
Hope this helps!
xxx