It's cool to see someone trying hard to make nice wallpapers. A lot of people are gonna tell you all these are are Gimp tricks and anyone can do it. Don't take this the wrong way, but this is true. Doesn't take away from the fact some might like them though. I chose to post on this one because this is the one that I am not satisfied with. The others are just fine - yes, they're simple and yes, there's not a lot of technical things in them, but they're fun and attractive. This one however, I wish you had taken a little more time with. The colors don't blend the best and it does need more than a simple black background with a flare and then save. Try to get a little more creative, but you have a good start going. I'm not much of an artistic guy, so I appreciate your work - maybe if you read a few docs on the Gimp it might give you some ideas on how to better utilize it.