I need a middle name that goes well with [name]Lilly[/name], and spices up the very familar name.
[name]Lilly[/name] [name]Winola[/name] or [name]Lilly[/name] [name]Winona[/name]
[name]Lilly[/name] [name]Amoret[/name]
[name]Lilly[/name] [name]Florence[/name]
[name]Lilly[/name] [name]Opaline[/name]
[name]Lilly[/name] [name]Rowena[/name]
[name]Lilly[/name] [name]Thalassa[/name]
[name]Lilly[/name] [name]Paloma[/name]
[name]Lilly[/name] [name]Marisol[/name]
[name]Lilly[/name] [name]Adeline[/name]
[name]Lilly[/name] [name]Katherine[/name]
[name]Lilly[/name] [name]Miranda[/name]
[name]Love[/name] [name]Lilly[/name]! I prefer the [name]Lily[/name] spelling, though–I would think it would be annoying to always have to say, "No, [name]Lilly[/name] with two "L"s… no, two “L"s in the middle…” Plus, I like that [name]Lily[/name] reminds me of the flower. [name]Lilly[/name]'s nice, though. 
I’ve always thought [name]Lily[/name] [name]Serena[/name] and [name]Lily[/name] [name]Ophelia[/name] were nice. They spice up [name]Lilly[/name]/[name]Lily[/name] quite nicely, I think. I think [name]Lily[/name] [name]Pearl[/name]/[name]Lilly[/name] [name]Pearl[/name] is a nice double-barrel, but I’m not sure how much it spices up [name]Lily[/name]/[name]Lilly[/name]. I’ve seen it used several times in real life, so I’m not sure how unpredictable it is.
What about:
[name]Lilly[/name] [name]Emmeline[/name]
[name]Lilly[/name] [name]Juliana[/name]
[name]Lilly[/name] [name]Clementine[/name]
[name]Lilly[/name] [name]Fiona[/name]
[name]Lilly[/name] [name]Penelope[/name]
[name]Lilly[/name] [name]Juliet[/name]
[name]Lilly[/name] [name]Seraphina[/name]
[name]Lilly[/name] [name]Zenobia[/name]
[name]Lilly[/name] [name]Aurora[/name]
[name]Lilly[/name] [name]Theresa[/name]
I also really love the idea of [name]Lily[/name] [name]Felicity[/name]/[name]Lilly[/name] [name]Felicity[/name], but I’m not sure if that’s too rhymey for you…
I also love the idea of [name]Lilly[/name] [name]Adeline[/name].
Good luck!