I have now updated both the short and long package descriptions.
corenominal@kermit:~$ apt-cache search crunchbang-theme
crunchbang-theme - CrunchBang look - GTK, Metacity and Openbox theme
crunchbang-themes - Additional GTK+ and Openbox themes.
Full description reads as:
Description: Additional GTK+ and Openbox themes.
A collection of GTK+ and Openbox themes to use with CrunchBang Linux.
The collection contains:
* CrunchBang-Dark-Grey
* Dyne
* Dyne-Dark
Regarding merging the packages, I would prefer to keep them separate as 'crunchbang-theme' is part of the 'crunchbang-look' metapackage. Any updates to the metapackage mean all other included packages will be updated. The idea behind 'crunchbang-themes' is that it can be easily updated to include additional themes as and when needed, without having to touch the metapackage.
By the way, if anyone would like to suggest any themes for inclusion, please do so. 