I am working on a reading list of Holmes/Holmes pastiche for a 2015 reading project (yay!).
If you can recommend any, give them to me in the comments. I've already added the first book of the Mary Russell series, so I don't need those, and Titan books publishes a multi-author "Further Adventures of Sherlock Holmes" series.
A link to the list is here, so you can check out what I have already added: list.