US National Archives
National Archives: Tokens & Treasures Gifts to Twelve Presidents
These gifts are unique records of each administration from Herbert Hoover through Bill Clinton. Many of them are handmade artworks. Some are from well known artists and others from supportive American citizens.
Other
Fed Stats: Mapstats for Kids Color Scheme
Mapstats is a unique cross-curricular site that uses maps to teach about monochromatic color.
US National Archives
National Archives: Designs for Democracy
A collection of government approved drawings and designs for hundreds of objects including ships, bridges, flags and more.