Second series characters ARE open for regular personality, style and any sort of "person" themes. For example, you can stamp someone as "Irene Adler" or as having her style, even if the stamp doesn't exist yet. (Although I'll need to make a new stamp, so please be patient. xD) So do feel free to vote for any of them you wish.
In other news, the next theme will be the "Character Residence Theme". So, Irene's house, 221B Baker Street, etc. Tell me if you have any other suggestions, as always.