Walnut is a straight-grained hardwood that ranges from chocolate brown (when it's from the center of the tree) to yellow (from the outer portion of the tree). A top pick for head-boards, ornate antique-style dining tables, and mantels, walnut is typically clear-coated or oiled to bring out its color.
Pros: It's a very strong and stable wood that can take intricate carving. The color can be beautiful.
Cons: Some may not like the variation from dark to light that's sometimes found on a single wide board. It's also one of the more costly woods.