Martin, the snap to grid method is timeconsuming and only works perfectly when each of your objects is exactly the size of the grid and (crucially) has crisp (non-feathered) 100% opaque edges, which is not at all obvious or automatic. But a dark grey background will fix your map perfectly.
The snap to grid method you used makes for a nicer map (those little imperfections are a good thing once the white is gone) but is very consuming. Faster is:
a) make a 5x5 (eg) section of 25 of your tiles, very carefully using snap to grid and rotate.
b) slap a 100% opaque dark grey background behind it to erase any barely-visible whiteness and to get crisp edges.
c) merge the two layers.
c) crop layer to exactly those 25 tiles - make sure you crop EXACTLY and have this block align to your grid.
d) move this layer of 25 tiles to align exactly to the top-left of your image and aligned to the grid.
e) FILTERS-MAP-TILE and in the box enter the dimensions in pixels of your desired final image and untick that bloody create new image box. Press enter and you now have an image covered in your lovely tiles.
f) add a layer mask and block out the bits you don't want to see.
We can make those brick segements seamless easily - just post one of them up here and I'll show you.
In the meantime, you can use this one I've made for you from a photo. Bring the image into gimp on its own layer - the layer should be the size of the bricks section, otherwise autocrop the layer. then:
a) scale to desired size: constrain proportions and only worry about the WIDTH for now.
b) FILTERS-MAP-TILE and in the box increase the X AXIS ONLY by a lot of pixels, but NOT Y axis and untick that bloody create new image box.
c) you should now have a long wall, relatively seamless (sorry rush job). duplicate the layer x5 or whatever and rotate them around your picture and delete the bits you don't need then fix up the corners.
EDIT d) (actually a - do this first) - using the colours/hue tool modify the colour of the brick to a nicer yellowish colour. I've only just realised I posted you some dodgy purple bricks).
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