Grey indicates being uncommitted, uncertain, having a 'grey area', depression or the mental denial of emotion. It is a common color in relationship dreams where you suppress your feelings. For example, dreaming of your fiancé wearing a grey wedding dress shows that you suppress your feelings. The problem here is that when you are not in touch with your feelings, you are unlikely to be aware of it. Only when you do a therapy to restore that connection will you have a frame of reference to know what the difference feels like.