Here’s a cool idea – they carve pencils with an X-acto knife into all kinds of interesting shapes: Pencil Carving.
Update:I see that J-walk is sending people here because of this entry (Thanks John!), so I want to pass the credit along to Clifford Pickover’s Reality Carnival blog, where I first saw it (Sorry Clifford!) – if you like cool, weird things that make your brain feel good, please go check it out.