Wow! That's pretty! I like the 1/2 braid, then the dark purple. As for the quilting...I was stumped when I did mine. I ended up doing FMQ in a curlicue wavy vine type of design. I drew up a design on a roll of paper the length of the braid, copied it onto Sulky Solvy with Crayola washable markers, pinned and did my stitching with variegated thread. I love how it came out. You trim away the larger parts of the Sulky Solvy when done and the rest washes out.
Echo quilting looks good on braids. My favorite is feathers, but I'm not that good yet!