Thanks @womanwithatorch! These contests are a win-win-win. The sponsor/advertiser gets amazing exposure, in appropriate context.
We (Orchid) get amazing content that makes the community experience more rich and durable. The Orchid participants win prizes, and it gives me an excuse to reward paying Gold and Platinum members with augmented chances to win prizes, etc. as a thank you for supporting us and to encourage others to do likewise.
One thing I don't want is advertisers crowding out the technical and business discussions that make Orchid so valuable, so I look for ways to have advertiser participation without disrupting the flow.
So... I definitely want to do more stuff like this. A few other contest ideas I have...
1) Show us your jewelry sketch book (5 sketches of jewelry, something like that)
2) Something related to the jewelry gallery - showing us stuff you've made
etc, etc etc.