I found my old Honshu lying around and decided to paint it. I had nothing better to do.
How I did it:
1. Found my Honshu Karambit lying around
2. Acquired red acrylic paint (Used to build model cars, and they just happened to be lying around as well)
3. Acquired old paintbrushes
4. Painted the blade with a brush, carefully.
5. Let dry for a few hours, and painted the webs with a permanent marker, carefully.
6. ???
7. Profit