Those gridlines you see in Excel can be turned off, if you'd like. You can still go ahead and put borders around cells, but to turn off the display of the entire grid, go to the 'View' tab on the ribbon, and look in the second group - Show/Hide. Uncheck 'Gridlines', and poof! They'll disappear from view. Should you decide you'd like to see them again later, just go back to this same spot and check the box again.