I'm quite pleased with my handywork which is silly because it took about two minutes to make.

http://zoestevens.smugmug.com/Hobbies/yarn-and-knitting/IMG0858/1236760117_cvzX2-M.jpg

http://zoestevens.smugmug.com/Hobbies/yarn-and-knitting/IMG0859/1236760145_P923h-M.jpg

The holes are 2mm, 3mm and 4.5mm approximately, and the shell itself is just under 2". I think I'd like to maker a larger one at some point, but this shell was free so I can't complain! Saving a buck is saving a buck, right?

I really like that!! How did you get the edges of the holes smooth?

Thanks! The drill bits are a fairly high grit (100 or 220 I think) so the hole ends up pretty smooth around the edges.