Pretty much everything. You can create a custom cover design, which is then glued to bookcloth that's available in a variety of colors. Inside each notebook there's a decorative endsheet, which can be stock designs or completely your own. The notebooks are sewn with waxed thread, also available in a variety of colors to match your design. Inside pages are available in graph, dot grid, lined, or blank. And last but not least, the packaging belly band is customizable to include your brand's information.