I don't know about you oblo but in our house the menu looks something like this- lunch- dh and dd sandwiches, ds school dinners, baby ds and me: protein & salad. Dinners: 1 meal each day of something made with: pork, mince, chicken, lamb, beef, a roast and usually a takeaway or pre-prepped or meal out. No wonder we get bored, this is literally every week!! So I try (try) to mix it up by getting different things on rotation, so this week I've done prawns in Mayo, falafel, Tuna, and egg muffins with my salad! I might try a new salad dressing or make some dips; this week I also tried avocado for the first time so have been adding it to my shake in the morning which gives it a lovely smooth texture (tried a bit on its own and ye gods, it's foul!!)
Dinners are trickier because there are a lot of us and we don't like change- but I get the books out for ideas really, write my shopping list for the week and then I know I've got the ingredients I need in. It's so easy to get stuck in a rut and it just makes this plan the bad side of difficult doesn't it- as in, it's doable if the food is varied and delicious and inspiring, but if you're hungry and then your tea is a plate of boring leaves it just doesn't seem worth it!
Our local tesco had a fast days magazine/book type thing (ie it was with the mags but it was more of a thin book) advertising 300 calorie meals and 500 calorie 'days' menus. Would something like that be helpful?