I do it all the time; they keep longer than a week, but that might depend on your freezer.
I've done curried egg (hard boiled egg, butter and curry powder mushed together) but egg can be dodgy to freeze (I think it needs a good coating of butter), so try a small batch first! As a kid my mom did this with ham and cheese, chicken, cheese. Probably other stuff, I've forgotten. In those days we were allowed to take peanut butter to school, so probably that too.
The thing that has the best hit rate in my family is home-made pizza rolls. I make up a batch of regular dough in my breadmaker (or by hand, breadmaker is faster), then divide it up, roll them flat, put in the toppings, and close 'em up and bake them.
Min