I think everyone here knows that while I love graphics, I also LOVE abstracts. I know this has already been discussed, but since we're listing, why not?
Abstract generator.
With two or three oscillators per axis with sliders to control the fq. Also an RGB oscillator and a blanking oscillator. I think this would be awsome. I am not sure if different wave forms could be used for each of the oscillators on an axis. I know James was afraid that harmonics could damage scanners and no one wants that. But I think this would be awesome and I think it has probably been a heavily requested feature, but there it is anyway.
Again, I gotta give my props to the coders here, all of you guys are awesome.