A stitch-in-the-ditch would really make each piece stand out, as if in relief, but that's a load of work. Still, it would be pretty. . . And the other's are right, anything with curves on anything so angular would be nice, so take your pick of curvy patterns, but not too tight, or too noticeable. You really want those pineapples to take center stage!
Beautiful quilt! Nicely done!