these screensavers have sound, can be muted from settings or even better by opening the windows 7 volume mixer just after viewing preview you can reduce the music to next to inaudible. These screensavers work best with proper codecs installed (such as k-lite). if theres any problems please let me know in the comments.these ones are creditless.

kind hard to find videos on youtube soo
included is
"Tooi Nioi" by YO-KING [Gintama OP2]
“DONTEN” by DOES [Gintama OP5]
“Stairway Generation” by Base Ball Bear [Gintama OP7]
“Light Infection” by Prague [Gintama OP8]
“Fuusen Gum” by Captain Stridum [Gintama ED1]
“Yuki no Tsubasa” by redballoon [Gintama ED3]
“Shura” by DOES [Gintama ED5]
“Speed of Flow” by The Rodeo Carburettor [Gintama ED8]
“Sanagi” by POSSIBILITY [Gintama ED9]
“Ai, Ai, Ai” by GHOSTNOTE [Gintama ED11]
“Kagayaita” by SHIGI [Gintama ED12]
“Wonderful Days” by ONE?DRAFT [Gintama ED15]

you can check source files from http://eizoutokuten.blogspot.com/2011/01/creditless-dvd-gintama-openings-endings.html. they have 3 screenshots for each clip