Hello, this is Sarah from Naptime Momtog. I am one of the newest writers for Paper Heart Camera. I am so glad to be writing here. I just bought Lightroom 3 while it was on sale and I love it so far. I still have a lot learning to do, but thought I would share how to do collages in Lightroom.
First you want to go to the folder where the photos are located. Once you are there and you have your photos edited and ready you will then go up to Print.
Lightroom has several built in already. I have also find some from this site. If you sign up for her email updates she sends monthly freebies. Anyways you decide what template you want to use. Then you just drag and drop the photo into the boxes.
One thing you do have to watch is make sure it is cropped where you want it. Unlike photoshop I haven't figured out how to drag the photo around to get the area of the photo you want shown.
Then when you are done adding the photos you go to Print to File and save it.
After that I open it in photoshop to resize and watermark it. I just wrote a tutorial on how I do that process here. Here is the final product.