The old standby for things like this is some combination of the initials for your names followed by "design" or something similar. It's not terribly creative, but it would get the job done if the domain name is available.
Otherwise, if I had a really good idea for a domain name I'd use it myself!
You might try to think about what type of client you intend to go after and make it something appealing to their interests. For example, if you want to focus on wordpress customization you could be "wordpresscrafters.com"