I do not think there is a website with examples of letters of continued interest. Hopefully this will give you some great ideas.
#1234, Memorial Street
Dear Sir/ Madam/ Dean _,
I am writing to express my continued and strong interest in attending _ law school.
Paragraph one: Why _ law school is your top choice…. (The great law program.. and how it is related to a career you are interested in pursuing…..location, maybe reputation….or both parents are alumni of the school and encouraged you to apply….
Paragraph two: How you will be an asset to the law school/ student body (work experience…your background, academic credentials…basically market yourself and give the law schools reasons why they should accept you over another student…how will your presence make the law school community better?
Paragraph three: What have you been doing since you submitted the application?( Since I submitted the application, I have continued to be a dedicated student as well as an active member of the school community. Just recently, I was nominated for the nobel peace prize or whatever...
Thank you for reviewing my application and I hope to hear from you in the near future