The problem isn't that you're not artistic, it's that you haven't spent enough time goofing around, and cribbing from other people's work to say that you are.
Everyone starts out aping someone else. You find things you like, you copy it, you tweak it, and sooner or later, you'll eventually start developing your own style. The most important thing is that you stick with it.
Like with web design, I can guarantee you that the people who's work your copying themselves got their start copying bits and pieces from other people's templates, learning from the best. After awhile, they started getting a feel for what works and what doesn't, what they personally like, and what they don't, and now it seems like they're able to semi-magically create these awesome looking webpage layouts with no effort at all.
It's not raw, ingrained talent that's important. It's whether you like doing it, and have the drive to stick with it until you're good at it.
