Well I've been looking around various vector graphics and it's just amazing how so much can be done in a few hours. So far I think that the sunburst effect with a grungy and rainbow like background behind a black silhouette. This has been very effective and looks very appealing to me. Of course I use Inkscape so it takes me a while longer to make the same effects as those with Photoshop because of brushes. Grr... I make it all from scratch.

Overall i've been wondering if anyone can give me some pointers about how to make more appealing effects which can be achieved relatively easily. Send me a note even if it's a small tip. Thanks, enjoy my work!