if you're looking for labs to practice in CCNP preparation, check on http://gns3vault.com/Table/Labs/
There are many labs :
So how do you expect to learn if not by cofiguring from scratch?
Doing that will help you troubleshoot as you make mistakes, solidify your understanding of the labs and interaction etc.
Once you understand the concepts you can save core configs and add/change as you need to practice.
I 100% agree with peter, remember that the ROUTE exam is pretty heavy on configuration, building from scratch is the best idea in my humble opinion, maybe look at gns3 vault and others for some topo ideas, even an old google images search for CCNP ROUTE labs will return some interesting results to imitate too, but configure them from scratch.....this all help solidify implementation plans and config etc, verifying along the way....
Cheers and best of luck!
I have to agree with Peter & Warren....it is one thing to do a lab with a pre-configured router and completely another to configure the router from scratch. I have personally found it very beneficial to configure all of Jeremy's CBT Nugget labs from scratch. Very much worth the time and effort.