I have been saving the 2 1/2 dozen egg crates to use to start seeds. You just cut them apart and plant right in the garden where the cardboard will break down in the soil.
I reuse sour cream, cottage cheese, whipped topping, etc containers for storing leftovers and other things.
Newspapers are used under messy projects, for cleaning, packing fragile items, and more.
An ice cream bucket is my sugar canister and I also use those for gardening, as a cleaning bucket, and more. I save garden scraps in one during the summer and take it out to compost (at least I will this year, last year, I just saved it and threw the scraps on the brush pile) I love those and need to buy more ice cream just to get the buckets!
Old t-shirts, towels, or flannel sheets are cut into rags for dusting and cleaning.