Sorry folks - when I asked for your opinion I obviously didn't explain myself properly.
The thing I couldn't decide on was whether this block works with the burgundy background regardless of the other solid colour - I'd always intended to use a variety of fabrics. Initially it looked strange to me as I'd just finished stitching a load of I-spy blocks in brights with a white background.
Anyway now I've done four of the dratted things I think it will probably work as long as I can keep my teeth gritted long enough to put together a total of 25 as the fabric is a complete pain to work with.
I was going to sash it in the burgundy and use the other colours as cornerstones......... but I do have a bigger piece of the greenish beige piece you see as second down in the fabrics on the right. So I shall sash in that and use the burgundy for the cornerstones instead - the sashings will probably be either 1.5" or 2" width.
I think the dark green and brighter burgundy at the bottom of the selection probably won't give sufficient contrast for the blocks so will probably leave them out of the equation altogether.
Things have started to get very busy indeed at school for the next few weeks so I'm pretty tired each evening but I have been cracking on with the stitchery - pictures to follow.
Just have to keep on stitching...............