A friend had a quilt made like thisi and she stitched on the diagonal seams both ways. It depends on how close you want to quilt it. She put rickrack on the diagonal about every 12 inches. But I don't think you would want that on a man's quilt. You could couch yarn about hat spacing for some texture. Maybe find some varigated in the colors of the quilt. No ideas for the borders, except a diagonal pattern that would break to go on to the next space????