Business Card Comps:
Take the 16 documents that are your business card thumbnails.
Group the layers of each document into folders.
Drag the folders into a new document (3.5x2.0@150-250dpi)
Create at least 8 layer comps (window>layer comps) from your materials.
Should be able to see at least 4 color/texture changes and at least 3 font changes.