I like to take a them and/or colors from something I see that I like. Such as a painting, piece of clothing, fabric, outdoors. I may use several things I like, or only one or two.

I just started using "PlaidMaker" free online and am now matching plaids to cards I have made It's a lot of fun and has helped me really look at what I'm trying to match. You can also make stripes and twill patterns. I also line the envelopes with it. They don't always turn out - I put them in a " dead box" and will some day think of a way to resurrect them. I also like to jazz things up once in a while with matching color self adhesive rhinestones, or pearls for something very classy or simple. Or on baby cards. I like lace that I rub colored pastels on the edges to match with other colors.