Baby Baker Street (Kid!lock Fancast)
Gulliver McGrath as Little Sherlock Holmes
Thomas Sangster as Little John Watson
Dakota Fanning as Little Rosamund/Mary Morstan
Raffey Cassidy as Little Irene Adler
I have several different fancasts, but these are my favorites. Also, there might be a part 2 for the others, if I feel like it.