The Christmas tree is put away and work has resumed on the tree skirt once again. This is Cloud Filling, a stitch to fill in large empty spaces. It's made by taking tiny stitches and weaving the thread through the stitches.
Then we have Fly Stitch Leaves. I like the look and it's quite easy. Basically, nested Fly Stitches.
The last picture is Cretan Stitch Leaves. I traced a leaf shape, then filled it up with Cretan Stitches that are very close together.
I did a row of Siennese Stitch but I used one of those shiny threads that are terrible in photos.