I figured writing their names would be a good start. The coordinates can be a bit tricky so I created this worksheet (attached) with the grid of coordinates. You can print these and have students write their names (block style) and then transfer the coordinates into their program. By the way, you can use this worksheet for any Scratch project that utilizes coordinates. The educational purpose of this project is to teach the coordinate system and programming concepts. 4th and 5th graders should be able to handle it.
Here’s the screencast and finished example:
http://www.youtube.com/watch?v=JZtYD4svnhA&feature=youtu.be&hd=1