Thanissaro has several talks on this issue. This is just one of them:Pushing the Limits
Desire & Imagination in the Buddhist Pathhttp://www.accesstoinsight.org/lib/authors/thanissaro/pushinglimits.html
All phenomena is rooted on desire. The only thing not rooted in desire is nibbana. But as Thanissaro says in another talk (i've heard it from a mp3), nibbana cannot be cloned. You cannot emulate it by adopting its characteristics. Therefore, you have to gradually follow a path that will lead you there; a path rooted on skillful desires. Even some "healthy" aversions are necessary to a certain degree in some stages the path, like the aversion to unskilful actions, unskillful states of mind, bad companions, etc.