I've just finished one, using a jelly roll of rainbow batiks, and mitered the strips together to get a diagonal join.
This type of join isn't any more time-consuming to my mind than straight seaming them, and gives a nice transition and movement. I'm glad I did it that way with these particular fabrics.
When doing the miles of piecing, find a good audio book to listen to! It's only the first seam that is REALLY long! After that, the sewing just flies.
I'm just deciding on borders now - maybe a dark blue Bali blender...
These are fun to make, and I am going to try another one with a more themed, unified jelly roll.