Open Peeps - A hand-drawn illustration library.
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
Control Illustrations - 108 free flat illustrations with customizable characters
Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
DrawKit - MIT licensed SVG illustrations, in 2 styles
XYplorer - File Manager for Windows