Starfield
Something I've been wanting to do for a long time. It transpired that making a starfield simulator is a doddle: once I found some half-decent references at least. The basic principles were very easy, indeed the only major difficulty is an equation that describes how 3D points are translated onto a 2D surface. I played around with various graphics performance increases too, and toyed with inserting foreground/background images in the field.
[Screenshot will follow]