I came across a few spectacular sources of old photographs and wanted to pass them along here. Included in that album are team photos from the first teams fielded at MSU, a photo claiming to be the "first touchdown" of the program (taken in Ann Arbor against Michigan, of course :-)), and some sweet pictures of the stadium, Munn, Daugherty, and our Rose Bowls.
MSU Archives has a ton of stuff on there, outside of athletics, too. See the entire archive here.
Quick disclaimer: I have no affiliation with MSU Archives or any of those pictures or anything at all whatsoever. I'm just a dude who found this one day and wanted to share.