Originally posted by tuggie76 I didn't expect a great shot, but find this is almost useless.
Yeah, I think its generally understood that ISO above 3200 is pretty bad, and pretty much useless above 6400. Unless you have a camera that costs $5000+. But even then, that ISO would be far from beautiful. Higher ISO number always means higher amount of digital noise (both luminous and colour)
Anyway, you can buy another lens with faster aperture (f5.6 can be too dark for indoors; try something that is f4 or better yet f2.8), use a slower shutter speed (like 1/60, but with telephoto and moving subjects that if often impossible, too blurry). So the final solution is to use flash or at least very powerful continuous light. There are many types of flash, they freeze movement and light up the scene nicely, but ... well, they are flashes. There is a noticeable, bright shot of light.
With the photos you have, especially if you shot raw, use something like Topaz Denoise, NoiseNinja (might be free? not sure if it still exists) or one of the other specialized Noise reduction software out there. That can help you get better results.
Also, you can turn the photos black and white, which will make the noise colour cast look more like "film grain".
Good luck