I've been trying to using this for a while, at overall it was good but unfortunately I noticed Ultipolaroid is incompatible with Opera :(

well, just hope the author willing to fix it on the next release.

Well, even though I can't say it as 'straightforward', I think the markup errors are not that hard to correct.

The errors are mostly located on attributes that didn't use quotation mark, while the rest caused by '/' wasn't placed on self-closing tag.

The markup language it using is already xhtml-compliance, The error could be just author's typos ;)

Beside that, this is a nice plug-in, I'd give 4 start for it. Too bad it has been suspended :(