Generate textures from folder of images

Essentially what I am trying to do is create a terrain from heightmap data and then texture that using aerial photographs from a specified folder.

So far I have found a terrain importer which will generate a terrain from information in a text file. This doesn't really provide accurate results currently - http://screencast.com/t/qT2q3AN1

Moving on from that, the terrain generated is 112x72km, but I have high res images for a 10x10km area within that. Is it possible to load in the 10 1x1km images from a folder and position them on the terrain object?

From what I've been reading I'll likely need to use Resources.Load but I'd like it to be as simple as possible & avoid having to define each image manually.