DOCBOOK-APPS: Customizing htmlhelp

Dear All!

I created htmlhelp file with MS's HTML Help Workshop v4.74
I dod this after converting docbook xml document with saxon and htmlhelp
stylesheets to html files and workshop project.
I wonder if there are any cuctomise sty;esheets to produce a better looking
htmlhelp, e.g. with different background, font, etc.?
Or maybe I can do that with HTML Help Workshop?

Thank you!

Dmitry