How To Turn Image Into Tiled Image

I'm trying to make a method that takes an image and turns it into a tile image. So if the original image looks like this:

[URL] ....

then the output image should look like this:

[URL] ....

Here's a method that's supposed to do that but for some reason the output image looks the same as the original:

public static int[][] tile(int[][] arr){
int[][] tile = new int[arr.length][arr[0].length];
for (int i = 0; i < arr.length; i++) {
 tile[i]=arr[i];
}
return tile;
}

I recently changed the method and the error message I'm getting is "bad operand types for binary operator '+'. Here's the method:

public static int[][] tile(int[][] arr){
int[][] tile = new int[arr.length][arr[0].length];
for (int i = 0; i < arr.length; i++) {
for(int j=0; j<arr[i].length;j++){
tile[j]=(tile[j])+(arr[i]);
}
}
return tile;
}