For obvious reasons (perfect shade of blue, flowing art nouveau lines!), I love this cover. It belongs to a book by a silk manufacturer and it offers embroidery, knitting and crochet projects:
Ford, Anna Grayson, ed., et al., Treatise on Embroidery, Crochet and Knitting with Illustrations, adapted to the use of M. Heminway & Sons’ Wash Silks (Oriental Dyes). New York, M. Heminway & Sons Silk Co., 1899.
You can browse and/or download it for free here. Here are some of my personal favorites:
Crochet designs for trims and edgings (yes, I'm still into crochet trims!)
all images are taken from Treatise on Embroidery, Crochet and Knitting with Illustrations