I’m really struggling to find a good technique to paint the grey/green/silvery Elven cloaks , nothing I try seems to work and it’s driving me insane , any tips?

Here is exactly what you're looking for....in a better video that I could ever begin to explain here... enjoy !

https://www.youtube.com/watch?v=ZThD7jqyfYE

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T'was in the darkest depths of Mordor, I met a girl so fair..
But Gollum, and the evil one crept up and slipped away with her..

Very appreciative of the quick response and the help, so thanks!The technique looks very effective , I hadn’t considered contrast paints either.. not quite the colour I’m looking for though haha

Any ideas on colours to use?

If you Google Citadel Paint Chart, and click on images tab, one of the first images that you'll see if a full paint chart, showing all shades of all colors, from darkest to lightest...

Every color of the rainbow is there for you - enjoy

_________________
T'was in the darkest depths of Mordor, I met a girl so fair..
But Gollum, and the evil one crept up and slipped away with her..