How to downgrade my iPhone from iOS 7.0.4 to iOS 6.x.x or 5xx? Is it even possible?

I want to downgrade my iPhone from iOS 7.0.4 to iOS 6.1.3 or 5.1.1 or any other older iOS. I just really don´t like design of iOS 7 and can´t help myself. :-/
Problem is, thath i have no SHSH on my iPhone, i have checked it on iFaith or tiny umbrella. Just i have no SHSH saved because i have bought iPhone 4 just before few months.
I watched many many many videos on youtube, how to donwgrade it but there are some videos which are saying that you can downgrade to iOS 5.1.1 using redsn0w and of course that you can´t downgrade it if you don´t have SHSH saved.
Some videos were also saying that someone can hack it and send you on your email SHSH files, which you need.
Btw. I have jailbreak on my iphone 4 and I´m using iOS 7.0.4.
Sorry for my english, hope you can understand what I mean:-)
Have a nice day and thank you for your answers. ( just please tell me that it´s possible to downgrade it back. :-( )

Nope. Just get "iOS 6 Icons For iOS 7 Theme" package from cydia. It's self explanatory. Here is a screenshot.