damn those took a long time to load.
The magma one is alright, i like the color and the theme is definately there. Once thing though is i think it doesnt explode enough. I mean, you have the right idea. But there is not realism in your explosion, it looks flat behind the render. The brushing should ro right into the render at different layers and levels so that it appears to be just as 3d as the render.
@ the second, i like the colors, but i think thats all it has going. I like the shine effect, but thats about it. The rest doesnt appeal that much. Maybe a sig out of it would be cool though.