You'll be coming into your autumn now I suppose, so you could stake the plants and hope they ripen to red. I have started to use fermentation of peppers and chillies and there's loads of information on the internet about this. Basically make a brine of one teaspoon of salt to one cup (American size) of warm water. Chop up the peppers and add garlic chillies an onion or shallot and a carrot and cover with the brine. Make sure everything stays under the brine - I use Kilner jars and a small freezer bag part filled with water to keep them under. Let it ferment for 5 to 7 days (or longer if you like fermented veg) then strain off the brine, reserving the liquid. Blend all the veg with a cup of the brine, add apple vinegar and/or sugar to get the taste that suits you and put into jars in the fridge. Should keep up to 6 months - and the flavour develops over that time. Fermenting is the only method of preservation that improves the nutritional value of the food - lots of good pro-biotic microbes for the gut!