This one is super simple - I just got styrofoam stars from Spotlight, spayed them with a spray adhesive and then dipped them in Marth Stewart glitter and you have instant twinkly stars.
The next one is a real easy one too. You can buy DIY clear glass ornaments (they also have good quality plastic ones in you have youngens in your house). All I did was get some white feathers, sprinking them with glitter and poke them into the bauble. Easy!
And here is my finished tree, I just put on some lights and a few of my sentimental ornaments that I have collected over the years. I'm very happy with it, now all I have to do is make sure Winston doesn't climb up it!