While the travel agencies
may be willing to sign you up with only a year of experience or even as a new grad, many of the hospitals
specify that they will only accept travelers with a minimum of 3 (or more) years experience. Hospitals pay a huge amount of money for travelers, and they expect, for that amount of $$$, to receive a seasoned "pro" who is ready to walk onto the unit and do the job -- travelers get minimum orientation, often just one or two shifts, and are expected to be ready to function independently. If the hospital wanted to put the time and effort into orienting a new grad, they could just hire a new grad ...
I strongly agree with the other posters who have commented that, even if you can find 1) an agency that is willing to sign you as a new grad and 2) a facility that is willing to accept you (as a traveler) as a new grad, it would be a v. risky thing for you to do and, IMHO, a serious mistake. The agencies are looking to make money for themselves, not look out for your best interests and professional "growth & development" as a graduate nurse. This cannot be said too often: No one is going to look out for your license but you
, so you had better do a good job of it yourself!