people quilt with old vintage singers---any machine with a nice straight stitch can be used to quilt-
but yes- you can embroider your quilting if that is what you want to do.
as for outter borders you could match the blue, the orange- or even the yellow and put borders which would work just fine- just match one of the colors and you could prehaps use the blue for the borders- then bind it with yellow or orange- or do the opposite- border with orange- bind with the turquise blue.
you have plenty of colors to work with-choose your favorite. what ever you choose will bring that color out more in the body of the quilt.