Big Purple Blob (Adriana)

For my birthday, Jane gave me some gorgeous Cherry Tree Hill Supersock in the purple and blues colourway. I loved it so much I didn't even take a picture of the yarn, I just wound it up and cast on. I had sworn off triangular shawls last year but Phoe did such a great job with her Shetland Triangle that I was inspired to make one of my own.

There is what it looks like right now:

The camera was having a lot of trouble with the colour. It's a lot more purple, and a lot less blue than it looks like here.

I've done 11 repeats so far, instead of the 8 in the pattern, because I wanted a bigger shawl (also I had lots of yarn). Now I think I'll do one more rep and then start the edging. The question is, do I continue to use the same yarn for the edging or do I use a darker purple?

Here is a close up though given how off the colours are, I think it might defeat the purpose.
Normally I'd just carry on with the same yarn but recently Carrieoke make a purple Shetland Triangle with a darker border that looks amazing! Mine would be less of a contrast but I think it might make the colours pop a little more.
Thoughts?

Also, I am destashing some Koigu Kersti if anyone is interested. (This destashing thing is addictive!)