Oh dear, I'm going to step out and say I love how your blocks look on the assortment of colored fabrics. I'm not sure chevrons is the best choice, once you strip them and sew them in alternate directions around your blocks, but I like the changing colors of the proposed sashing. It feels unexpected and somehow modern, or at least out of the box. It's your quilt. If you like it with chevrons, use chevrons. I'm not a fan of sampler quilts, but adding an unexpected or modern element makes it more appealing to me.