[Skin Concept]: Naptime Lulu
She's wearing fuzzy bunny slippers, a nightgown, and the typical sandman hat. Her staff has an hourglass attached to it.
Her Q is two shooting stars. Her W sprays a trail of sand behind her if used on herself and turns the enemy into a sheep when used on them. Her E is a shield of swirling sand, when attacked, the sand in the shield displaces itself for a brief moment. Her Ultimate makes them large (duh) and displays the cosmos swirling around them.
Pix is also a star. Alternatively, a sheep, alternatively, Pix is wearing a nightgown as well.
Thanks to Kissed as well as Lenadha for concept art sketches.