[Thematizr.com]

Yes, you can embed a single category: http://kb.ecwid.com/w/page/15853258/...duct%20browser.

The CSS is quite customizable too, but usually it takes some skills and efforts to achieve a good look for the whole store. We recommend to use ready made themes like the one we offer to change the look of the whole store in under five minutes and with skills as great as an ability to copy and paste.