Here I have made a simple metal grill texture which is completely seamless. I added small little detail touches to the metal, making it more realistic. Resolution is 2000 x 2000.
Another metal texture I made. It's a metal texture with diamond studs. There are dirty marks all over. The texture is fully seamless as seen in the tiling demo. Resolution is 2000 x 2000.
This is another metal texture I created. It is fully seamless. I added some weathering to it, so you can see marks and bits of rust colouring. Resolution is 2000 x 2000.