Hi Wrathchild
I would gladly send you one if I had it.
However this is a trick you want to get a handle on if you can.
Even if you have only a basic digital camera you could take a straight on photo of a local sidewalk around your area and take it into Photoshop, (if you have it of course) and do a "offset edges" to it.
Filters>Other>Offset edges
This will help make it look seamless when expanded.
If you don't have photoshop you could try:
a free photo editor, but don't know if it will do offsets or not.
here:
http://www.paint.net/
Here's a site with a basic explanation.
http://www.photoshopsupport.com/tutorials/cb/seamless-tiles.html
and
http://www.cadtutor.net/tutorials/photoshop/seamless-tiles.php
lec
ps
Your photo looks very similar to one of me in 72, only I had a funny pipe in mine:-))
Would it be the same vintage?