IF you want Themes for your E-commerce at WordPress

http://www.tripwiremagazine.com/2011/12/best-wordpress-e-commerce-themes.html
http://storefrontthemes.com/
http://www.smashingmagazine.com/2011/10/19/free-e-commerce-wordpress-theme-balita/
You may want to consider to use some professional themes to make your blog look better. Again, the above link will direct you 30 themes for E-commerce at wordpress.