custom paint/ photoshop question

[Daytonagp4]

Ok, I wanted to do a custom paint job on my bed. What i wanted was ripping starting right in front of the rear well and widening out to the rear. I want it to look like under the paint where it has been ripped up is gears, hoses, and other mechanical stuff. If anyone can tell me where i can find something that kinda looks like this that would be great if someone wants to photochop it that would be even better i will get a pic of what i kinda want it to look like later but you get the idea.

[Daytonagp4]

kinda like this but all black and what is described above

[Daytonagp4]

anybody even wanna give this a try? i cant do it i tried and failed