For the former I'd make a texture for something like BB's skydome using some background piccys from Nasa Those can be used freely without copyright issues. If you want a 3d style, which has depth ands where some stars move faster (sideways on) than others, is to try using my Parallax scroller freebie. It's a bit complex, but if you're patient it works really well. Click the banner/link below and choose Concepts & Tutorials from the menu. For the warp effect use particle illusion by wondertouch. The SE edition used to be free. Use that to create a short video then import that into poser as a video background. Thats what I used for the Trek transposter style freebie in freestuff here.

Pinky - you left the lens cap of your mind on again.