There are single, double and triple Irish Chains so I'm not sure which you are thinking about. Quilt in a Day are excellent books, so if you want to buy a book, that's my recommendation. Irish Chain is a classic and you can find patterns on the internet. Contrast is going to be the key to the success of your quilt. The white with dots would be a cute background fabric. The darker purples would be good for the chain. Just remember that the same value in fabrics will all "blend" together in looking at the quilt once it's made. Hope that helps.