I've seen this sewing tape fabric around in a few places and have had my eye on it. The back is creamy yellow. Both cushions have envelope backs rather than zippers or buttons.
I got part way through making a third cushion but my machine suddenly decided not to play and the stitches went uneven and messy. I was tired by then so after unpicking, changing the needle and fiddling around with the tension to no avail I put it all away and made scones instead (lovely gluten free ones based on this one but with chopped up crystalised ginger).
If in doubt, make scones.