Blocks that can have Blocks/Items placed in/on them

Okay so pretty much I am wondering how you can make a block that when right clicked on with another block or item it places that block/item on it. like if I have a jar that when you use a cookie on it you now see the cookie in it. Or the best example I can give, Bibliocraft's display blocks, where you can place your tools/weapons in them and see them, but click on the item and take just that item out and no longer see it in the block. but I want to do it with real code and not a model for every item on the block