Flashes of 2ch/mona primarily, or anything at your disposal as long as it isn't super trash. (Are there any world2ch flashes?)
Since the world2ch uploader sucks, upload using this one with 10000KB uploads : http://home1.catvmics.ne.jp/~forapesu/upload.cgi (on the bar right of the "Browse" button, you must select "swf")