Winter's Timber Staff Skin
From Guild Wars 2 Wiki
“Double-click to consume.
Seasonal. For sale only during the Wintersday season. Use anytime to upgrade the appearance of a staff. Usable only by staff wielders.
— In-game description
All Wintersday wooden weapons have a wintery snowflake glow as well as a pulsing white branch design. The staff's branch design sprouts from the staff's head. A picture of the staff's glow can be seen here.