Thorn of the Lily - 30 second GCD AoE with a potency of 340 to the first target and half that amount to additional targets (slightly more than Holy 2), gives one lily, and empowers the next Blood Lily by 10%.
Afflatus Inspiratione - Can only be used at 2 stacks of lilies. Cost 1 lily to increase the DPS of an ally by 3% (increases personal damage by 5%) and shield 400 potency for 15 seconds.
These skills would cause Lilies to suffer from the same problem as Energy Drain. Lilies would never be used for Healing again since, optimally, it would be better to utilize Inspiratione to increase DPS of the party. Also, why does it require having 2 Lilies but only uses 1?
Another "issue" would be button bloat. I personally think it's a crock of an argument but everyone and their mother will argue against adding more buttons, at least without consolidating/removing other skills to justify their inclusions.