A full Gwen skin gallery, plus the practical point: some skins change the silhouette enough to matter in a fight.
Before the cosmetics: Gwen is a fighter at 150 attack range whose job is to trade repeatedly, survive the return damage, and win the third exchange rather than the first.

Gwen has 6 skins, excluding chromas. The art below is the in-client splash.
Skins change no numbers. They are not therefore free of consequence — a skin that alters the silhouette or recolours an ability changes how quickly an opponent reads what you just cast.
That cuts both ways, and it is the honest reason some players keep the base skin on champions they take seriously.
Gwen's attacks deal bonus magic damage based on the targets health. She heals for a portion of the damage dealt to champions by this effect.
Gwen snips her scissors in a cone up to 6 times dealing magic damage. Gwen deals true damage to units in the center and applies her passive to them on each snip.
Gwen summons mist that protects her from enemies outside of it. She can only be targeted by enemies who enter the mist.
Gwen dashes a short distance then gains Attack Speed, attack range, and magic damage On-Hit for a few seconds. If she hits an enemy during that time, this Ability's cooldown is partially refunded.
Gwen hurls a needle that slows enemies hit, deals magic damage, and applies A Thousand Cuts to champions hit. This ability can be cast up to two more times, with each cast throwing additional needles and dealing more damage.
A former doll transformed and brought to life by magic, Gwen wields the very tools that once created her. She carries the weight of her maker's love with every step, taking nothing for granted. At her command is the Hallowed Mist, an ancient and protective magic that has blessed Gwen's scissors, needles, and sewing thread. So much is new to her, but Gwen remains joyfully determined to fight for the good that survives in a broken world.
Skins are tied to the account, not to you. Anything bought on a smurf stays on the smurf — worth knowing before spending real money on one.
Full Gwen page — abilities, stats and every skin →