Sources, clockwise from top left: one, two, three, four, five, six, seven
World Maps Online seems to be a really good source for full-wall map murals. They have a lot of size options and the maps come as either peel and stick pieces or as wallpaper, so you can pick how permanent you want the map to be. [1, 2, 3, 4]
Etsy is one of my favorite websites to find art, and I was seriously amazed at the number of creative maps available. I found that a lot of the art prints were smaller in size, but when we found a small one we liked and e-mailed the shop owner, they sent us to two other re-sellers (fine art america and imagekind) that had the same prints in much larger sizes. [1, 2, 3, 4]
And of course Etsy is a great place to find vintage pieces, if that's more your style. Again, a lot of these won't be super large, but they're definitely cool and unique. It seemed a lot of the maps are high-quality scanned prints from old atlases or other publications. [1, 2, 3, 4]
We even found a few large posters on amazon (you know, like from your old geography class) that made our short list, but we ultimately decided to go with a more original art piece. [1, 2, 3, 4]
We decided on a 40" x 60" of this watercolor print - it won't fill up the whole wall as a mural, but it's definitely big (and colorful!) enough to make a statement.
What do you think about decorating with maps?