Is there any tool to convert joomla and wordpress template to Drupal 7 theme?
Artisteer is not good enough you cant get the original look.So better manually convert the theme.
1.Take any Drupal 7 framework like Zen and Genesis 2.Style the CSS using the joomla/wordpress style sheet. 3.Use the same design elements used in old theme. 4.Use some Modules like Views and Panels to get the teasers in front page.
If you are not good enough on coding go to some Freelance web designers to do the job.