Here's something a lazy or pressed for time DM might find useful - using the free image editing software GIMP, you can make a fairly decent world map in seconds. I discovered this by accident today while working up a logo from the Create submenu...
Step 1: Create the land.
Change the size and experiment with the random seed and elevations.
Optional Step 2: Add a square or hex grid overlay. GIMP comes with the square grid pattern already installed.
If you'd like to use a hex grid, you'll first have to install an additional script. An example of finished output is below, an example with square grid rendering is here.
Maps! My Real Maps!
48 minutes ago