Search LinkedIn for the admin job titles in Washington-based companies of the listed giver industries;
harvest contact info;
send message such as:
(title) Holiday Gifts 101 - Thanking Out of State Clients
(body) "Savvy companies send gifts at the holidays to cement relationships," says John V8, president of Washington Gifts. "Whether you're an All-Star admin or your firm's lead partner, sending gifts that remind clients about who you are builds business. It can be something that relates to your location, your line of business, or your company name. Anything that conveys a sense of who you are and makes people happy to think of you."
Washington Gifts specializes in gift packages from Washington vendors selected for uniqueness and quality, a perfect way to remind clients why they like doing business with you. Select a standard corporate package from our website, or custom build one just for your firm. Order now so your gift arrives before the company Christmas party...
(website link)
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Sorry I don't remember the business' exact name, but you get the idea. Maybe include a picture of a happy client with a gift box, and a quote?