Another failed attempt at posting a photo!
There is a border of sashing around the top now.
I think I will do 1 or 2 rows of HST's at the top and bottom using the 5 ins fabric and if enough bits a single row of small squares (HST) along the sides.
I can only try and hope I don't have to unpick

There are triangles in it!

I would just add another row of blocks - alternating the squares and triangle blocks.

OMG that is a stunner!

They're great, @Missie and I do like the no frills, or rather no unasked for and often rather twee labels or envelopes approach.

I was thinking about a row or 2 of HST - any thoughts?

@Bjay When I get to the 'what next?' point, I usually find that leaving the top where you can look at it in passing helps. The quilt will tell you.
Depending on what you have left, maybe another frame then HSTs or flying geese? Of course they don't have to go all the way round... you could go round opposite corners, or part of each side. If you're short of fabric, you might find you've got similar colours that you could sneak in to pad out the remains. If you just want to add length and aren't worried about symmetry (ie all 4 sides must match) just add patches top and bottom and declare it finished.