A recent book in the world of paper is 1000 Handmade Greetings - Creative Cards and Clever Correspondence, compiled by graphic designer Laura McFadden. It contains lots - hold on a sec, that's an understatement... 1000!... contemporary card ideas. Be forewarned, this is not a technique book and there are no instructions; simply put, it's a gallery of inspiration that includes examples of paper cutting, stenciling, stamping, punching, photography, stitching, screenprinting, etc., etc. Here's a sample page to give you an idea of the layout. These are some of my favorites - pop up cards by Tracy Chong.
Several of my quilled designs are included along with quite a few by paper filigree expert and author, Claire Choi. This window card, which features a gold-gilded ring coil flower, mulberry paper, and stamped metallic leaves, is one I created for the book. It would be suitable for so many occasions... birthday, wedding, get well, or even as a sympathy card.