have a problem to create a material

Hi guys,
I’m creating a game with cubic graphic,
but i have a big problem.
The materials,Now for example,i want to create the “block” Terrian which is divided in 2 parts,
3/4 brown and 1/4 is green.(i dont know how to explain it)
Now the question is,how can i create that block i said before?
Probably the Answer will be -Use Cinema 4D-
okay but that isn’t the problem,the problem is the texure which i have to put into the cube.
The big Problem is where can i find the right texure,
the texure i finding is similar to the cartoons(ex willy the cojote)
Do you know any site that have those texures i said?
hope you understand