[neaisha]

Skin1
-Customer
-Main
-products_t.tpl (if you have set your appearance in admin to display 2-3 columns). If not, you'd edit the products.tpl file for 1 column display.

Look for this line <td width="{$width}%" class="PListCell"...

and add the above code (changing the colors to whatever you want) behind it.

that should do it.