The blog is great, but i have a question. I've tried using Polyvore but can't figure out how to crop the final collage so that the images aren't drowing in white space...is there a secret? Does the editing space have borders that i can't see? How do you do it?

The images do have "boxes". When you select an image use the gray outline around it to not only size your image but use it as a gauge as to how much space to use. You can use the "zoom in" & "zoom out" feature to "crop" your final collage, but if any of your image boxes fall outside of white space, polyvore will automatically resize the image (this could be causing the problems with negative space). I usually "center" my image then zoom in until I am satisfied before I publish. Msg me on polyvore and I will look at your sets if you want :)