I put an edge on my HPL swatch. 

I did a single loop edge at the botton right and then changed to 2 loops together after that and along the top edge I did 2 twisted loops as an edge. 
Next, multiple swatches together!
ciao

I did a single loop edge at the botton right and then changed to 2 loops together after that and along the top edge I did 2 twisted loops as an edge. 
Next, multiple swatches together!
ciao