A good many years ago I bought this little metal frame. At the time it was marketed as a modern alternative to a Christmas tree and came with drop beads to hang from the arms. But, as soon as I saw it, I knew it would be perfect for displaying tatted Christmas tree ornaments (I live in a tiny flat so a normal size tree was out of the question.)
The patterns are mostly just snowflakes or the centres of mats.
The outer rings are those cheap metal bangles that little girls like. You reverse chain around them pushing the chains tightly together to cover the ring and catching in the outside picots of the snowflake at suitable intervals.
The inner rings are curtain rings, again tatted over in reverse chain stitch, but with picots or rings or whatever is needed for the start of the pattern worked at the same time.