Ready For Some More Quilting

My Dads bird quilt is finally done with quilting, I still need to sew in the threads and put on the binding. Pic of the quilt will follow the next couple of days.

In the meantime the next quilt in line is waiting to get quilted. The blocks are out of the birthday-block swap of QLR my theme was rainbow colors. I love how colorful this quilt turned out. I´m just not sure about the quilting - I dont really wanna quilt through the blocks. Maybe some stitch in the ditch around the blocks and a allover quilting in the beige triangle. What color of thread should I use??? I think its to much color if I quilt the beige triangles with a multicolor thread - what do you think???