Designing a website

Hi there, i'm more of a developer than a designer at the moment i would say. However i would at somepoint like to set up my own company, creating and selling websites to local business etc...

The problem is when it comes to the actuall design of a website i seem to have a lot of trobule. Some of my designs can start to become similar, and look rather boaring and plain.

I want to improve my designs but don't really know how.

Whats the best way to get over this and start design some good, half decent looking website.

Thanks in advance guys.