My control center doesn't have the 3D look?

I got the iOS 7 yesterday and unlike what I've seen on the commercials, whenever I use my notification centre or control center, it doesn't have that "3D" look where it shows the colour that is used on the background. It's just one plain colour (grey for control center and black for notification centre). I have an iPhone 4 though. Any idea how I can change it so it has a better graphic?

Because you're using an iphone 4. The hardware can't handle some of the new stuff including the looks IOS7 has normally on the 5 and newer phones.

Here is an explination that does it better than me: http://arstechnica.com/apple/2013/09/new-lease-on-life-or-death-sentence-ios-7-on-the-iphone-4/