A great tool to figure out color schemes is the
Adobe Kuler (free to use).
http://kuler.adobe.com/It will give you RGB (along with HSV [hue, saturation, value], CMYK, LAB, and HEX codes so you can match colors to other things you may find elsewhere).
It allows for multiple types of color schemes - analogous, monochromatic, triad, complementary, compound, shades, and custom. You can also create a color scheme from an image which is a GREAT feature if you have an image you really love and want to pick colors out from it (would be great for matching colors to your photos).
Also, there is a massive library of user schemes and many are named by a theme (i.e. what the color scheme reminds the user of - like cherry blossom might consist of several shades of pink plus greens).
ALSO... one last place for color schemes that is great (I think they use the image feature on the Kuler site to get these, by the way) is
here.
http://www.photocardbout...egory/color-inspiration/The images used are heavy on the wedding/flowers side, but there are schemes of all kinds - bold and bright, soft and muted, etc. Check it out, it's a great resource. While the colors are in HEX code, you could use the Kuler to get the RGB values for them.
They also have card making templates and ideas elsewhere on the same blog.