This is the emblem that first got me thinking about collecting these great looking graphics. They envoke the highest levels of patriotism.
Eagle Emblem Collection
Nunc Sidera Ducit
Flying on a shield
In this image the eagle looks like it is ready to take off from the shield. Arrows and an olive branch are commonly found in the eagle's talons.
E Pluribus Unum
This series of eagle emblems contain a banner with the words "E Pluribus Unum" ("Out of Many, One").
More on this motto can be found at wikipedia.
More great Eagles
Here are some more great eagle emblems. I will continue to add to this collection as I find good images.