Me tried install new themes on N810 running Diablo. There was an error "missing directory". I created directory for this. Then themes were installed as well. But I didn't like'em and wanna remove. Damn this tells it cannot delete themes. Not even one. In log I see this:

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hildon-application-manager 2.1.16
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Uninstalling vista-12pt 1.1
(Reading database ... 20535 files and directories currently installed.)
Removing vista-12pt ...
/usr/share/themes/Vista-12pt/set_theme: error while loading shared libraries: libhildonwidgets.so.0: cannot open shared object file: No such file or directory
dpkg: error processing vista-12pt (--remove):
subprocess pre-removal script returned error exit status 127
....
....here zip reads lot of files....
....
/var/lib/dpkg/info/vista-12pt.postinst: line 5: cannot create /home/user/.osso/hildon-home/user_filename.txt: nonexistent directory
/var/lib/dpkg/info/vista-12pt.postinst: line 13: /usr/bin/home-image-loader: not found
cp: cannot remove '/home/user/.osso/hildon-home/original_titlebar.png': No such file or directory
cp: cannot stat '/usr/share/backgrounds/hildon_home_bg_user.png': No such file or directory
cp: cannot remove '/home/user/.osso/hildon-home/original_titlebar.png': No such file or directory
/usr/share/themes/Vista-12pt/set_theme: error while loading shared libraries: libhildonwidgets.so.0: cannot open shared object file: No such file or directory
Errors were encountered while processing:
vista-12pt
E: Sub-process /usr/bin/dpkg returned an error code (1)

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I didn't find dynamic libraries shown above. How can I remove those themes correctly? They consume several megabytes.

Is this from the Application Manager log, or did you use a commandline tool? If so, what was the exact command you used?