I have small site (like 15 visitors per average day) but I really like to watch statistics in Piwik. I have done one modification (hard hack - so on upgrade it will be propably overwritten):
I am now using Identicons based on IP adress on Visitor Log instead of IP - it is perfect, because my visitores are returning (some of them are writing to my FB or continue to my other site) and I can follow them and learn their usage easy way.
I think it will be brilliant if I can choose in Settings directly to show identicons as a way of “privacy protection”.
Maybe it will be better to use “visitor Id” - I have seen it somewhere in code…
labs.jtl.cz is my place, where identicon script works. I think many users can enjoy this feature and is easy enough to integrate. Bec you can include that identicon script into Piwik (its GPL).