Yep, I like TWM on design too, but both CTWM and IceWM can be equally configured.

On CTWM, you can straightly import the TWM config modulo some slight error on a single line (if any). Once you set profer TTF fonts for it (by default they might look huge on smaller screens), you are done. Set the sticky/persistent menus (on a laptop/netbook it's a godsend) and you are done.

Maybe you would like to disable the startup screen (-W flag for the 'ctwm' binary) or some obvious option in the man page in order to be put at ~/.ctwmrc or ~/.twmrc.

For sticky menues you need to just put

     StayUpMenus

at ~/.ctwmrc

Just copy the content from your former ~/.twmrc file and append that on top.