I joined a swap on Alphastamps.com for Halloween Slide Mailers. I managed to take some spectacularly bad photos of these for some reason, but here's what I came up with.
I really like the one with the devil skelly peaking thru the window on the outside and the little skellies on the inside. You can't tell from the photo but there is a sheet of mica between the window frame and the picture of the skelly on the front.
(I wasn't able to get a good picture of the inside of the 3rd one so I didn't bother to put it up)
Most of the supplies I used can be found on these pages:
Halloween Collage Sheets
Paper Theatre Collage Sheets
Black Dresden Trim
BEWARE and black fence stickers
Poison Rubber Stamp Set