You can make it in creative mode. No need to be rude, I know you didn't mean it that way bt maybe he didn't comprehend it.
nonam. open it up in a paint program. then shorten a bit where you can. if you need to shrink it even more use the rectangular selection tool. then select the whole big and drag it up and to the left until that section is as small as you can allow it. fiddle around with it and you'll get it
i couldn't get any texture packs (i dont know how to ) If you click on picture its= comes up with smaller version then click on that to see full sized pic