This box is made from Peruvian walnut (dark wood) and curly maple (light wood).  
The box's sides are joined with half-blind dovetails.  A complete diagram in SketchUp
and PDF formats will be coming soon.
This box is made from purpleheart (dark wood), cherry (lighter wood on sides), and
Russian birch plywood (light wood on the bottom).  The sides are joined with box
joints in each corner.
This box is made from zebra wood and maple.  The sides are joined with a handcut
dovetail (one in each corner).
Maple sides and walnut top.  Mitered corners with dovetail (key) splines.
Box joints.  Large box/tray.
Box with mitered corners.