There are industry clubs - oh I mean associations   that have this information.  Here is a list of some of them:
 
http://www.greetingcard.org/   Greeting Card Association
http://www.colormarketing.org/  Color Marketing Group
http://www.pantone.com/pages/pantone/index.aspx  Pantone North America
 
You'll have to pay of course, because they are clubs er, uh, I mean trade organizations. But membership will give advance peek into the color trends for the upcoming seasons and years. This goes for any industry that banks on colors. For example: Interior decorating, print, motion graphics, and of course textile fashions. Marketing surveys cost big $$$$ and they try to recover the costs.
 
I just attended a color seminar on a different topic - (not from one clubs of the above). The lecturer was fantastic! The one thing that I remember, is too much solid yellow and solid orange is hard on the eyes. Break it up with other colors.
 
Of course, sales of the colors differ from country to country. The North American color trends is different than the "International" color trends.  

Thanks, guys!  The actual design is going to be a black/white thing, but I thought maybe I'd throw a nice simple solid color behind it.  Simple will pull focus into the design the best - now to decide on the color!
 
I appreciate the feedback!

Hi Peggy, all,
 
I did a search for "most favored color this spring" and got some interesting sites. According to this study, blue is the fav.  
http://www.joehallock.com/edu/COM498/preferences.html
 
Well, like Randy said, is has to do with your mood. I actually got to thinking about this last night when I wanted to put a pale lavender border on a card and my doggon art program was stuck on blue.   After much fiddling I finally got the color purple out of it. It looks ok.