Photoshop :: Brush Wrap Effect

I like to make patterns in photoshop and usually my only way of doing this is by making an image, then transforming it down 50% and left 50% (So it takes up 1/4th the image) then pasting the image to fill up the other 3 quadrants. After doing this I can see the seams that would normally be at the edge of my pattern, then I can edit them out. This gets more and more time consuming as my patterns get more complicated.

I was wondering if there is any way to change the brush tool so that if I draw over the edge of the canvas, the brush will automatically send those pixels to the opposide side. Sort of like in old NES games where you could run off the edge of a level and reappear on the other side of it. Or you could stand on the edge of the level and mario would be half on the left and half on the right. Does anyone know what im referring to?