Sandwiches... OK this is a no brainer but "think outside the bread" :)
Meat and cheese roll-ups... roll favorite lunch meat with cheese and secure with a toothpick
Meat and cheese cut into shapes... I don't have the time and patience for this but some kids love it and it helps them be more adventurous.
Crackers ... add with cheese and meat and you have home made Lunchables!
Leftovers... anything that can be eaten cold, IE: Pizza
Frozen grapes... My kids LOVE these. I buy lots when they are on sale wash take off the vine and freeze.
Home made muffins ... freeze them! they will be perfectly defrosted by lunch :)
Freeze yogurt cups ... this was a revelation to me! My kids love it and it's like they get ice cream with lunch! You can freeze the individual cups from the store or buy the big tubs and make your own.
Apple sauce ... make your own and freeze like the yogurt! Or buy the super size jug at the store and portion it out into your own containers.
Cut / wedged Apples ... There are a few ways to keep them from browning... drizzle any citrus soda you have over them. I have been using a lemon lime soda from Aldi it's about .89 for 1 liter. Or wedge then wrap tightly back into it's shape with a rubber band or plastic wrap. The surfaces won't be exposed so the sugar will not oxidize as fast turning it brown. Use less sweet varieties, they brown slower!
I will be adding more to the list but this is a start.
I also want you to know that I used to only think I could put pre packaged snacks and goodies in my kids lunch. It is only over the last few years I have begun to get more creative with their lunches.
See my all about lunch page for some pics of my kids lunches