From flyingthehedge.com

Wednesday
This day of the week gets its name from Woden’s Day, an Old English name. It is a direct translation of the Latin term mercurri dies, “day of Mercury.” When they translated the day, they changed to god Mercury to a local god, Woden, so people would understand. This is a great day to work on communications, thought, wisdom, self-expression, and the arts. Also a good day for divination.
Color: Purple, orange
Planet: Mercury
Deities: Odin, Woden, Hermes, Mercury, Athena, Lugh
Crystals: Adventuine, agate
Herbs: Aspen, lilies, lavender, fern
Associations: Business, communication, debt, the arts, transportation, fortune, chance, creativity

From learnreligions.com

Wednesday is named for Woden himself, although the Romans called it dies Mercurii. This is a day associated with the color purple, the planet Mercury, and the metal quicksilver—which is also called mercury. See a pattern here?

When it comes to deities… yes, Mercury! However, there are a few other gods associated with Wednesday, including Odin and Hermes, Athena, and Lugh. Gemstones like adventurine and agate come in handy as well, as do plants such as aspen trees, lilies, lavender, and even ferns.

Business and job-related issues, communication, loss and debt, traveling, and journeys are all tied into Wednesday. This is a good day to do a working to open up lines of communication—especially if your actions are preventing you from being an effective speaker or listener. Go someplace new or return to an old favorite stomping ground, step up your game, and settle up your accounts.