DIYNetwork.com and HGTV.com offer table centerpiece ideas. A search on either website for "table centerpieces" yields numerous results, which can be further narrowed by holidays, occasions and decorating themes.
General principles of design should govern the choice of a centerpiece, according to Pier 1 Imports. Size is the most important consideration. A table centerpiece should be low enough to ensure guests have a clear view of one another across the table. A maximum height of 12 inches is a good guideline. Centerpiece width should scale with the size of the table. Finally, consider using a variety of elements in the design. Multiple textures and elevations add interest to the table and the centerpiece as a whole.