Interesting concept. I think this is a nice, clean design.My only conern is that it might be "run of the mill" in that other companies with this name might have something similar. Thoughts?
#63 is interesting, but I'm not sure if people will "get" that it's a pencil tip (at least that was my interpretation of the design. #51 to my eyes is soemthing I think I've seen before. #60 is intersting, but I thin I'm starting to lean more to the concepts with a pencil/pen and a prism of colors.
#81: I don't care for the look because I like an aligned, streamlined logo. To me, this looks like the pyramid was added in after the fact and doesn't really belong there.