I had a movie Shredder (the CGI movie), I liked the look of him originally, but the more I looked at him, the more the proportions didn't make sense, the legs were too skinny for me. So I searched the internet (and for some reason at the time of this post, I can't seem to find the picture so I can give the original artist credit, so if anyone knows, please let me know) and found a beautiful Shredder that I loved made from a ML Dr Doom figure. The blades on his shoulders and hands are sanded down, and the blades on the shins and forearms are made from a "For Sale" sign. The long sword's sheath is also made from the sign. The smaller sheath is just made from thin cardboard from a toothpick box, then wrapped in that mystery tape, then painted it black. The Japanese writing on the the large sheath reads "The Foot Shall Conquer All" (according to Google translator).

UPDATE 3/3/2015
I always thought that Shredder always looked more like a samurai than a ninja because of the armor and helmet, so I wanted his look to reflect that. I wanted it to look as authentic as possible so I just basically moved the swords in a position a samurai would put them on his belt