Though not an actual expansion, there's a nice button pop in CubexCursedxCurious episode 7 at about 4:20. You can get it subbed here:
http://www.nyaa.eu/?page=download&tid=260351
A quick note is that this is using a 10bit encode, so you'll have to use a 10-bit compatible player (those of you watching anime this season are probably already well aware). Here is a link to a guide about playing 10-bit encodes:
http://haruhichan.com/wpblog/?p=205
For those who are a bit lazier, I know the latest versions of CCCP (for Windows) and Mplayer (for Mac/Linux) support 10-bit, and I've heard rumors that CoreAVC and VLC have started supporting it too.
If that's not your thing, I'm sure someone can find an 8-bit reencode and post a link
EDIT: apparently should've watched the whole episode. There was also a TG/BE at about 16:30
EDIT2: Alright for the full episode, someone did a reencode of the full episode in 8-bit, so provided you can run .mkv, you should be able to play it:
http://www.nyaa.eu/?page=torrentinfo&tid=260378 There's also a .avi file which I'm not sure about that may or may not be 10-bit
http://www.nyaa.eu/?page=torrentinfo&tid=260362
Sorry about the technology issues...fansubbers this season really jumped on the 10-bit boat since it supposedly gives them smaller size for the same quality, but compatibility with that is still pretty weak. Usually if you're willing to wait a day or so and look around you can find someone who will re-encode stuff to 8bit for compatibility.
EDIT3: Noticed that Darkwing's Videos were still pretty big and the quality took a hit (no offense), made an attempt on my own to clip and convert and I think they turned out smaller/higher quality using MKVToolnix and XMediaRecode