First think about some of the reoccurring themes and intimate moments you and your fiancé share. Where was your first date? Which shirt of his makes him look the most handsome? Where did he propose to you? Where was your first kiss? Every one of these moments has a mood that they invoke. And if you were to pick a color based off the most potent of those memories what would it be?
|The Perfect Palette|
Lastly look at your venue. Is there wallpaper? Is the color of the rug very noticeable? If there are things that really do stand out then why not just work with them instead of against them. Use some of your supporting colors to help enhance the smaller details of the event. Accent colors tend to be on the opposite side of the color wheel, but that doesn't have to be literal. The opposite of purple is yellow, and camel (a yellowish brown very close to khaki) works great with all shades of purple and is basically the matte version of metallic gold.
Color schemes have proven to be one of the most stressful aspects of planning a wedding, and being that I was a visual-art major you could argue that I am a bit bias. But thanks to the Internet there is a lot of help out there. There are millions of websites with idea boards and examples you can reference. My favorite is The Perfect Palette; they have so many examples to choose from that you can look up based on color and/or season. Pintrest is also a great place to look (there are millions of girls out there planning their make believe weddings). Also doing a Bing image search can help you get a few inspirational pictures that best illustrate your colors, theme and mood.