Hi JJ. I don't do as many red days as green, but when I do I often make casserole type things.
Made one yesterday by frying (in frylight of course!) some onion and garlic, adding some skinless chicken thighs to brown off, then shoving in a load of sliced mushrooms, and after cooking for a few mins I added a couple of tins of tomatoes, some passata and some herbs, and shoved it in the oven for half an hour.
DH loved it, and it was really easy to make.
Better still, there was enough sauce left to use with pasta today!
Have you tried getting the big white free foods recipe book - that has loads of nice stuff in it - def the best SW book.
For quick storecupboard meals I tend to keep in a tin of M&S stewed steak in beer - it's free food surprisingly, and then I just do a load of veg to have with it.
Do you like fish? There's a good fishcake recipe in the book that I mentioned, and a recipe for a marinade for monkfish - yoghurt and lime - which is really yummy.
You can also do a proper Nigella recipe called one pan chicken. Put chicken breasts, new potatoes in skins (healthy extra) and loads of veg (peppers, red onion, whole head of garlic with cloves separated but still in skins, courgette, mushrooms, plus any other veg you like) all into one big oven proof pan, coat in a little olive oil (healthy extra) and bung in the oven, about 170 for 40-50 mins.
In terms of not losing on green, I find that if I've had a green day on weigh in day then I can be a bit heavier, so I tend to have a red day then, but green about 4 or 5 others. Might be worth a try? Do you also make sure that you drink plenty of water on a green day, as if you don't then your body will try and retain the water from the food you eat.