Great thread! Thanks everyone!!
I too, save all old cameras, phones, goofy clothes and costumes. Empty coffee canisters are drums, or building "blocks", or can be put on the grocery store shelf. I stole someone's idea (from here, but I can't remember who posted it!!) and made large blocks out of empty milk cartons (rinse/wash with bleach, cut the folding top off and slide one into another). They too are used for building, shopping, making walls for the car tracks. I tape closed the empty, sturdy cereal boxes. They can be used as giant dominoes. Empty 1 or 2 L bottles make for a great game of bottle bowling!
As you guys have mentioned before, I am finding myself weeding out the single use, battery operated toys. Kids more often like to play with "real" stuff anyway. And then I don't lose my mind when it (inevitably) starts to wear out. LoL