The dolch-with-sky-blue would be amazing -- I'd probably also buy a purple set (though I would prefer it with purple-on-beige mods, which would break the two color thing). Actually, how does dolch-with-blue or yolch fit the two color thing? Would it be all the lighter gray or all the darker gray or something?
I'm not sure how soware fits into the two-color restriction, either -- an entire board of very-light-blue-on-very-light-grey would look weird imo.