@Jmz, No I found it really easy to implament my own styles, see code below for initialising TinyMCE:
<script type="text/javascript" src="../tinymce/jscripts/tiny_mce/tiny_mce.js"></script>
<script type="text/javascript">
tinyMCE.init({
mode : "textareas",
theme : "advanced",
content_css: "/knaresborough-editor.css",
plugins :
"safari,spellchecker,pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,ibrowser",
// Theme options
theme_advanced_buttons1 : "save,newdocument,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,|,styleselect,|,cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist,|,outdent,indent,blockquote",
theme_advanced_buttons2 : "undo,redo,|,link,unlink,anchor,image,help,|,insertdate,inserttime,preview,|,tablecontrols,|,hr,visualaid,|,sub,sup",
theme_advanced_buttons3 : "charmap,emotions,iespell,media,advhr,|,print,|,fullscreen,|,insertlayer,moveforward,movebackward,absolute,|spellchecker,|,cite,abbr,acronym,del,ins,attribs,|,visualchars,nonbreaking,blockquote|,insertfile,insertimage,|,",
theme_advanced_buttons3_add : "ibrowser",
theme_advanced_toolbar_location : "top",
theme_advanced_toolbar_align : "left",
theme_advanced_statusbar_location : "bottom",
theme_advanced_resizing : true,
//Drop lists for link/image/media/template dialogs
template_external_list_url : "js/template_list.js",
external_link_list_url : "js/link_list.js",
external_image_list_url : "js/image_list.js",
media_external_list_url : "js/media_list.js"
});
</script>
I've highlighted the area that refers to adding your own CSS to the editor, I've also found a really nice little image uploader/resizer that plug straight into TinyMCE calle ibrowse.
Thanks
Sibbo