Finished main body, now starting edging. Will write what I do for a border here:

2 rows of double crochet, corners: 2 double crochet, chain 3, 2 double crochet.

Next row a shell stitch border:

Sl st into corner, skip the next 2 stitches then work all of the following into the next (third) stitch:

dc, ch 1, repeat 3 times, dc

(In other words, you will have five dc stitches each separated by a ch 1, all worked into the same space).

Skip the next two stitches and slip stitch into the following (third) stitch. Repeat across.