You might be asking yourself, "Really? Ashe Support?!". Let me say firstly, this build isn't meant to be a 100% viable ranked season build. It was never meant to be. This build is meant to be a fun, unconventional build that is meant to support your main ADC.

The beauty of this build is that it puts Ashe in a role where she doesn't have to farm cs. Instead this build is designed to utilize Ashe's passive. Letting Ashe charge her passive to 100% crit allows her to harass bottom lane champions while the ADC farms cs.

The great thing about Ashe is her ult, which is a great initiation tool or to gank champions that get too aggressive with your ADC.

Talisman of Ascension (with combined support masteries) allows Ashe to passively farm gold while charging her passive and hiding in the bushes.

Full Support:
This item build is designed to debuff the enemy team. Hurricane allows multi target debuff of both armor (Black Cleaver) and Healing (Greivous Wounds - Executioners Calling), as well as a multi-target slow with frost shot. Zeke's Herald provides additional support, but could be swapped out for a more desirable item. The idea of this build isn't damage, its to weaken the enemy team and maximize CDR so you can use your main tool, your ult.

Sniper:
Designed to maximize crit and still provide rebuffs (but without the multi target utility of Hurricane). This item set is more single target damage oriented, but still provides some debuffs through Exe calling and Black cleaver. More haste is needed for this build so Berzerkers Greaves were chosen over boots of mobility. Manamune can we changed out for a more desirable item if you so choose. Sweeping Lens trinket is preferred in this build so you can clear out bushes and keep you hidden so you can get those crit shots and wear down enemy lane. (NOTE: if you go sniper I recommend crit damage runes over attack speed)

Talisman of Ascension:
A great tool and the cornerstone of both builds. The active allows for quick getaways and keeps your gold farm up.

Both Ashe builds focus on recon and scouting. Clairvoyance was taken (and Scryers Orb) to add to the effectiveness of Hawkeye, giving Ashe 3 ways to scout the map. Additional stealth wards can be purchased to increase this.

Flash can be swapped out for Teleport, Ghost or even Revive.