Procedural Pixels

This is the latest screenshot from UTC (Untitled Tempest Clone). The weird blobby thing in the middle isn't important. That's a static image. What's important are those barely visible flecks coming out from the middle (you'll have to click on the image). They are one pixel PNG images that I'm totally messing with in code. They begin life as white, but they don't stay like that long.

Next, to make my own blobby thing. Ah, the minor victories...