Wanted to give a plug to http://concon.tictail.com for these amazing acrylic keychains featuring characters from the Fate universe!
Each side has a slightly different face. This is most obvious with Sakura Saber, who I did not order :) The creator has said she may design new ones in the future. Currently, you can get OG Saber, Red Saber (from Fate/Extra), Saber Alter, Saber Lily, Sakura Saber, Saber of Red (from Fate/Apocrypha), and Jeanne Alter.
imgur album with some closeups: