You can certainly use some CSS magic to make your product grids look native to your website. All you need to do is start editing a new grid!
You can create a new Top Sellers or Product Recommendations grid by going to the Library section of the top navigation and choosing Engagements Library. From here, go ahead and click Create New Engagement. At the bottom, you’ll see options for Recommendations.
Choosing either of these grids will open up their respective editors. You can customize the number of cells from here, the title, and the look and feel by editing the CSS section.