Ask any tabletop gamer and they'll be able to pull out a box of little extra pieces for customizing their plastic figures.  Attaching these extra detail bits is a great way to save time.  As a concept artist, you can save time in the same way - though your 'parts bin' is inside of Google Sketchup.  This video shows how to use the Sketchup component system to add quick detail to your designs.

AuthorMatt Kohr