Hi total nubie question and my first post here... hello

Been looking everywhere on-line and on my phone for the location in the file system of the Utilities icon (containing calculator, compass etc...) for the fiftyfootshadows theme I installed but cant find a trace.

Basically I love the theme but I would like to replace a few icons, all done except the Utilities.

Can someone please steer me to its location?

Device info: iphone 4 ios 6.1 newly jailbroken phone