How do I get Invoices to have grids or alternating lines of color to separate invoice details? I find it amazing that they don't have this option?

I would like to have a way to separate the lines in my invoices and estimates. Either a grid or some type of alternating color from line item to line item. Similar to the invoice I have posted. How do we do this? It looks so sloppy having it all bunched together even if I add blank spaces between items.