All of the images are 48 X 48 and you can download any of them by right clicking on the image and select 'save picture as' or 'save image as', etc.
You may notice that some of these images look familiar and most likely it is because most were used as icons. They are not useful in that format for the web so these are in the .png format. I think that having them look familiar, but as icons will help your site look very up to date.

Exclamation Point Shield Graphic

Four Color Shield

Red Cross Doctor's Bag

Alarm Clock

Binoculars

Blue Circle

Blue Question Mark

Brass Key

Black CD

4 Color Ball with Check Mark

Screen with Checkmark

Green Shield with Checkmark

Coke Can

Strange Design

Green Go Button

Green Stripes

Green Triangle

Lock

Magnifying Glass

Question Mark Shield

Red Cross Button

Red Cross Shield

Red X

Right Turn Arrow

Movie Screen