Two web sites for quality free-of-charge clip-art and stock images online. First, the Microsoft; it requires an ActiveX control to be installed for max quality, click the Copy button after searching and finding an image you wish to use.
http://office.microsoft.com/en-us/images/results.aspx
And second:
For max quality, in Firefox or IE, keep on left-clicking on the image you want until it fills your browser, then left-click on it and choose Copy, then paste into your Word or Adobe or other design application. Chrome doesn’t appear to have this at this writing, but you can do File/Save from any browser, and there are download links too.