Just to add a semi-related tip, not only can you change individual icons on your Home screen, or any other screen, but you can also customize your screens.
-- Using two fingers just tap and squeeze inwards, a grid with miniature representations of your screens will come up.
-- Your Home screen will have a little blue 'up arrow' icon next to it and all your other screens will have grey ones. You can tap on any of those grey icons to toggle it blue and that will make that screen your new Home screen.
-- You can also tap and drag each screen icon to a different position on the grid, and that will change the order in which each screen shows up when you swipe left or right.
-- The default number of screens in Touchwiz is seven. If you don't have a lot of apps installed you might not want all seven screens as one or more of them might not be necessary. You can drag each of those screen icons to the Trash Can at the bottom and that will remove that screen. Later if you want to add a screen back, tap the + icon and an empty screen icon will show up on the grid.