I have just used johnstones 'moonlit sky' in my bedroom - its gorgeous. Grey with definite lilac tones. Very similar to calluna I reckon. I love it. Very restful, definitely grey and modern but warmer. Crown soft clay also lovely but more beigey purple than grey.
Hi I have calluna and I love it. Everyone comments on it. It's quite changeable though. I have it in a east facing bathroom with tons of light where it looks gorgeous and then in a south facing living too Where it definitely feels a bit warmer/more lilac. It's very calming plus seems to go with almost anything I put next to it. Can def recommend.