There are a few organizations that offer awards such as the one you're wondering about.
Canadian Nursing Students' Association
Awards for Preceptors and Mentors
Recognizing the constant pressures facing nurses today, the CNSA, through the Certificate of Excellence in the Role of Nursing Preceptor / Mentor, wishes to recognize those who have assumed the role of Preceptor/Mentor and have made an outstanding contribution to the overall growth, development, and education of nursing students. CNSA members now have the opportunity to nominate those nurses they feel have had a positive effect on their nursing education. Students can nominate a nurse practicing in any capacity or role and nominations will be accepted at any time during the academic year.
The Toronto Star's Nightingale Awards
(nominations for this year are closed)
The Registered Nurses Association of Ontario
Recognition Awards for a variety of qualities
You can also check with your nursing school
and the hospital you oriented at to see if they have some sort of appreciation awards. Capital Health in Alberta has the REACH Awards, the Health Sciences Centre in Winnipeg has it's STAR Awards... I'm sure you'll find some way to recognize your coworker's excellence.