Household items for flowering?

[D.U.M.B]

Hi,
I was just wondering if someone could help me, what kind of household items can I add to the soil for the flowering period (stuff like egg shells, skins etc,) ?

[Turtlez]

Crab Shell
Crab shell, as the name suggests, is ground up crab shells with an NPK rating of 2-3-0. Its main benefit, however, is that it contains 23% calcium, particularly good for tomatoes since blossom end rot on tomatoes is caused by a lack of calcium. This slow release calcium will correct that deficiency.

i didnt write that. its from a book