Can I melt CD cases in the oven?

[wingles.livejournal.com]

I got a pile of clear CD cases from a friend. I checked the recycling code, they're #6. Polystyrene is what you use for shrinky dinks, right? So I should be able to melt these cases in the oven, too, with no fear of poisonous fumes or other dangers? Has anyone here tried this? I checked the memories, but couldn't find anything. If it's up there somewhere and I missed it, if you have a link or any advice, I'd appreciate it.