Use a wide range of basic techniques, including lettering, découpage, pop-up methods, embossing, marbling, stenciling, cross-stitch embroidery, appliqué, and even lovely paper quilling.
An excellent resource despite being published in 1993!
This 120-page book features 15 chapters with instructions for a different card crafting technique in each section. I especially appreciated the chapter on making your own paper. Even though the book is aimed at an adult reader, the last chapter is dedicated to adapting the various techniques to the smaller and younger hands of children.