"The most beautiful symbols are the ones that represent death..."
That quote came in mind when I first saw the respective scan. So after rendering it three times...(thank you GIMP...) and massacring it to get all the red out of it...I made this, along with a paired card here.
The symbolism behind it is related to the quote. The white lily is a symbol of death. Yumichika's power is killing his enemies beautifully by absorbing their energy and transforming it into his own while enveloping them in a frame of vibrant flowers. Beauty brings death, death brings rebirth, and rebirth is beautiful on its own...