At first, I was tempted to just shout "JULIA!" because it's one of my favorite names, too, but... while you pointed out that Liliana & Violet together would be "flowery," my eyes and ears were drawn to the fact that both Emilia and Julia end in "-lia," and together they appear a little match-y. So on that front, I would actually choose Violet.
However... what about Viola (vie-OH-lah)? I think the "floweriness" of Liliana & Viola in the same sibset won't be so obvious (not quite Lily & Violet).
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