Reading around on the tinterwebz somewhere or other, I came across Boro - the Japanese name for a very specific type of repaired textile. The examples I saw all seemed to be blue, repaired with indigo thread and patches, and knowing I had a wee pair of toddler jeans to repair I set to to work.
First I found some suitable patch material, culled from an old top of mine. I cut two patches, and roughly worked out where to place them on the trousers. Then I marked on a stencil of dots to guide my stitch work. I used one of the children's washable markers and a ruler to give me a rough grid to work with.
I pinned the patches in place inside the trousers, and then set to work, stitching across and then up and down to create teeny crosses.
The inside is fairly neat - and I caught the edges of the patch with a simple running stitch.