Well, depending on how big the motifs are you could always duplicate stitch them.
If it were me, I'd just check the gauge of the stockings (hopefully it's not too small!) And you could probably just count stitch by stitch to copy the motif. But that would probably take a long time. You could take a close up picture of the motif and enter it into Knit Pro to help you create a chart.
As for a basic stocking pattern, there are a lot of them listed in the Christmas section of Knitting Pattern Central, maybe you can find something there?
Good luck, that's a lot of stockings!