OK, so I made the decision not to stitch around the diamond shaped postage stamp fabric. I started stitching a couple of rows around the outside with glitter thread, then stitched across the shapes and 'quilted' it by linking points etc.
Nope - didn't like it :(
The problem is that the 'stamp fabric' shows up the holes if you unpick - a bit like sewing leather.
Ah well! It's not great, I don't like, but I'll just suck it up and perhaps when all the blocks are completed it won't look so bad (but I doubt it!).
Here it is - warts and all:
Hope your day was creative in some way!