Microsoft Online Clipart --you can click the categories or type in what you want in the search box. You will have the option to download--which will let you save to a drive or just copy.

Awesome Clipart for Education

Choose Images/Videos button on Kids Search

Choose Pictures button on Searchasaurus

Designed to a T Clipart

Free Clipart for Students and Teachers  - collection of b/w images

Pics 4 Learning

Animated Clipart (.gif)

Search for Clipart through Creative Commons Site