You can see Andreas’ full collection for sale at Behance, but I think this is ripe for a DIY effort.
They sell wooden plaques at craft stores, but upgrading to a finer hardwood like oak, maple, or walnut and cutting them out with a coping or jigsaw would make a more elegant and stronger finished piece. You can find all sorts of plague, badge, and shield designs online for patterns. For used bike parts, check out your local bike co-op or community workspace. To attach, take your handlebars to the hardware store, and size the correct pipe straps in the plumbing section, available in galvanized and copper.
See them all on Upcycle Fetish: Crafts, Furniture Design, Sculpting