If you want a completely new design, then you will have to know HTML and CSS.
You can use the supplied productlist.template as a base and modify it, or start creating your own templates from scratch.
The full list of available tokens and plenty of other relevant information is in Back Office > Admin > Help.
If you only want to make CSS changes to the default productlist then read the information I have provided in this post:
http://nbstore.codeplex.com/discussions/433904
Rob
You can use the supplied productlist.template as a base and modify it, or start creating your own templates from scratch.
The full list of available tokens and plenty of other relevant information is in Back Office > Admin > Help.
If you only want to make CSS changes to the default productlist then read the information I have provided in this post:
http://nbstore.codeplex.com/discussions/433904
Rob