Do you mean layers of stars or cloud like effects? It's already using a parallax background to get the infinite star space.
Sorry, but i cant see any parallax effect. The background looks like a flat texture. Maybe a bug?
It's one 1028x1028 bitmap that repeats endlessly using one parallax layer (hence the infinite starfield). If I added another layer with transparency and a lower factor, that would probably show it up more. EDIT: take a look at this video:
