Design created and put onto trousers - just a sample

Hi, We are creating some trousers called Sag Pooed.

We need a ultra realistic poss desingn placed on the back of these trousers so that it looks exactly like the wearer has pooed himself.

We need a sample image of the trousers with the poo stain - you can use below image
https://www.google.co.uk/search?biw=1440&bih=744&tbm=isch&sa=1&ei=Jzc_XMKSHYTixgPzw43oDQ&q=chinos+from+the+back&oq=chinos+from+the+back&gs_l=img.3...5162.7890..8149...0.0..0.50.598.14......0....1..gws-wiz-img.......0j0i67j0i19j0i5i30i19j0i8i30j0i24.HRVTmnD7u1s#imgdii=g33mqyzrVC4cEM:&imgrc=N56Sz6JhtQazNM:

We need a sperate JPEG with the poo stain so that we can supply it to the printer.