I've been using Dreamweaver to create my wireframes (tables).
Before I create my own css/html/icon framework I would like know if such a library already exists.
The ideal toolbox would include basic styles for all form elements, icons, css grid layout, sample standard ad sizes, and empty templates.
As far as I know, these all exist only separately. There are a few notable CSS frameworks, some with grid layouts, and CSS form styling is almost a separate discipline. As for web icons, take your pick!
The only place you're likely to find these all together (including plug-ins/add-ons) is in a full-blown web framework or CMS.
If you put such a package together for yourself, bear in mind that it will be useful to many others, make sure the HTML ad CSS validates, and choose css-based templates rather than table-based ones...