These stars are a dead give away that we use 3D software to make our animations. The third one was a challenge because I needed to thread two triangles together but I do like the end result. I have four solid stars in all and have also made some smaller and faster rotating versions of the larger ones. I have also experimented with a couple of animations on a black background that were not made with CAD software.
Maybe I should add the more traditional twinkling star animation but you do find so many good twinkle animations on the internet that I may not bother.
All the stars with a black background actually have a transparent animation background and can be used on any dark colored webpage. If you try to use them on a light colored background you will get a nasty dark halo around them.
Use the other selection of animations that I have placed on a white background if you intend to place them on a light colored web page. The stars that are absolute top and bottom actually have a black background with no transparency.