It’s a funny thing, but “Хрен получишь” и “Ни хрена не дам” the same. ;)

I haven’t heard the phrase “в хренУ” ever. Must be local.

Another form is “НЕ хрена ему знать об бизнесе” (не хрена instead нечего). And it would not me, if I don’t say about locative case although it very rare e.g. “поросенок, жареный в хренУ и майонезе".

My favorite is “xrenovi” which as an adjective means “crappy, of poor quality.”

One of interesting forms is “хреновина”. It’s both a vulgar naming of an abstract thing and a dish.

Что это за хреновина? — What the hell is that?

Мы заготовили десять банок хреновины. [I don’t really know how to translate that precisely]

Hrenovina is a mix of tomatoes with horseradish and garlic. It’s quite a spicy thing. It goes well with a bread and soup. And it’s a good seasoning for vareniky.

Here is a photo of this:
http://www.manhunter.ru/upload/a4/5a/a45ad673db526087788d13dfc976c762.jpg

There is also the word “хрень”. It may only be used to refer to something, not to describe the dish.

I had to laugh when I saw the phrase “Иди на хрен!", because of the use of “идти", implying that hell is a close-by place that we don’t need a vehicle to get to.