You can just do that in CSS
table.ng-table thead th:not(:first-child) {
border-left: 1px solid red;
}
table.ng-table thead th:not(:last-child) {
border-right: 1px solid red;
}
table.ng-table tbody td:not(:first-child) {
border-left: 1px solid blue;
}
table.ng-table tbody td:not(:last-child) {
border-right: 1px solid blue;
}
Example here: http://plnkr.co/edit/t77lzM1o6Xh2PBnhZqw6?p=preview
The only downside to this approach is that it won't work in IE <9.
To get it to work on IE <9 then you would have to add classes to each column when you define the <td>
and match them in css.
If you only want a border for a specific column then the css is actually easier as you can just add a class to the column you want the border on and then in your css just add a border-left or border-right for that td.col-style-name