Well, that depends. What do you like to eat? Chicken/Tuna salad is a great way to go. Instead of using regular mayo, use light mayo and use half the amount and add in a little bit of low fat sour cream.
I will often grill chicken on a Sunday night and eat it with some rice and veggies. I usually make enough to have for lunch on Monday and Tuesday.
If we make burgers, I will always buy the 90/10 or your burgers will be too dry. I buy enough meat to make 2 extra burgers and I will take one with me for lunch and throw it over some salad.
Yogurt first thing in the morning is a good way to get protein on the go. Be careful at what you buy though, some of those yogurts are deceptively high in sugar.
Not sure what you do for a living or if you're in school but I always keep a container of protein powder at my desk. Even on days where I don't work out, I still have a protein shake.
Yeah... I've eaten some really funky stuff in my day but I just can't bring myself to try Cottage Cheese. I agree though that it is a fantastic way to get some protein.