In this screencast, Word program manager Jonathan Bailor shows how to take advantage of the Theme feature new to Word, Excel, and PowerPoint 2007 when reusing content (“copying & pasting”).
Themes are one of the most useful features new to Word, Excel, and PowerPoint 2007. Put simply, a document Theme is a set of fonts, colors, and graphic/chart effects that are complementary and applied
globally to documents, spreadsheets, and presentations. This screencast demonstrates how a Word document’s Theme is automatically applied to “pasted” content. Translation: you can reuse content from PowerPoint and Excel in Word, and vice versa, without having
to reformat everything. A chart copied from an Excel spreadsheet with Theme X applied, will take on Theme Y when pasted into a Word document that has Theme Y applied to it. Put simply, pasted content 'fits in' with the rest of the document.
Jonathan Bailor’s Theming post
Microsoft Office Word team blog
Brian Jones' OpenXML Formats blog