IKEA ideas abound, but this is the best I have seen for a desk chair. IKEA hacks make me happy!
Mesh Office Chair inspired by Eames
WYETH - Edward Wormley for Dunbar - barrel back desk chair by Edward Wormley for Dunbar
Charlotte Perriand Les Arcs Chair - one day, one day. my favorite chairs!
Smile Chair by Marcello Zilliani
Pretty cool office chair
Making a Modern Mark in Manufacturing: Swan Chair - Design Milk