They do look a bit more like snow than stars, don't they! Don't worry, it's actually not that hard to do if you know how!
I dug through my old research on stars, and here's what I have (see below). Probably a good thing for me to do, because I needed to figure it out again anyway.
Look at this video, around the 11:43 mark, this is the video that first helped me to figure out how to do them:
screencasters.heathenx.org/wp-…He likes to have stars with 5 corners, but pony stars look more like they have 4, so set Inkscape to use the 'star' tool, set 4 corners, the spoke ratio to .044, and draw a star.
Make sure you turn the fill ON and the stroke OFF for the object after you've drawn it.
You'll end up with what looks like a black X-shaped object with very sharp points.
Use Ctrl-Shift-C to turn it from an object into a path. Delete the four interior nodes near the center of the star to give the interior rounded edges.
At this point, you have something that could be used as a star by sizing it appropriately. The curves could be a little skewed though, making the star look slightly off center, so feel free to fix those if you feel like it.
If you hold down Ctrl, you can size the star appropriately and put it where you want. You'll also want to change the file to white.
You can blur the star to make it look more like the stars in the show via the 'Blur' slider on the 'Fill and Stroke' panel. Somewhere between 1 and 2.5 is probably sufficient for Blur.
Now, if you want to duplicate and create more stars quickly, go to Edit -> Clone -> Create Tiled Clones to pull up the cloning dialog. You can use this to create large clusters of stars with randomized sizes/orientations.
Do remember that blur is computationally hard for Inkscape to display, so I would highly recommend hiding the layer with the stars on it when you're not looking at them, or putting the stars in last.
Hope that helps! Not sure it's as useful without a video tutorial, but I tried!