Can i change the color of my keyboard? How do i do it if so?

No.

Features of the iphone are in the manual:

iPhone User Guide (For iOS 5.0 Software)

You cant change the Colour of the keyboard

Settings > General > Accessibility > White on Black

That changes all the colours. So not only the keyboard.

Apple didnt give us the option to tweak the device that way. But jailbreaking gives you the possibility to tweak your device the way you want (including diferent icons, keaboards etc).

Hacking the iPhone also removes all the built in security included with iOS making the iPhone as insecure as an Android device which is the Windows of the mobile OS world in regards to security or the severe lack thereof.

If you refer to core access, you can only access it while on same network. Besides, solves the problem after you change the standard password. Unless you mean something else.

Besides, i cant imagine a hacker or a person or whatever, that would mark me as his/her target.

Anyhow, NSA has full access to your device anyway, so what kind of "security" are we talking about here?

The NSA does not have full access to my device.

Hacking an iPhone removes the built in security included with iOS allowing non-official apps to be installed from unknown and untrusted sources. Being able to download and install anything from a website also opens the iPhone up to malware which isn't possible with a non-hacked iPhone.

You don't have to be "marked" - all the Windows computers that are compromised around the world every day are not specifically "marked", and the same for all the compromised Android devices.

Yes you can. I just can't remember how I did mine lol