There are many online entries for very old pieces of språng on the Kelsey Museum of Archaeology's website, and many of the images show the collections to be in fragments.
Here is a språng bag that is mostly intact, record number 0000.01.3532
It is in three colours. The pattern is described as having been "made using sprang and twining," or what Collingwood would call intertwined språng on a background of interlinking.
Be sure to increase the image size using the drop-down menu. You'll want to use a computer monitor, not a mobile screen. Also be sure to click the description tab in the left menu. This museum offers the most comprehensive analysis I've seen for the structure of a språng piece and the yarn types in it.