Here's a zoomed in shot of one section of the Memphis side of the stadium (I took it from the ISU side of the stadium). That's a very heavy presence of ISU fans on the Memphis side. Also there were ISU fans mixed in there that weren't wearing red. I think it's very easy to underestimate the number of ISU fans at the game. I took closeup pictures of the entire Memphis side of the field and it was pretty much the same as below.
From way up in the air the Memphis side looks purple (blue with red mixed in) but actually had a lot of ISU fans on the Memphis side of the field. My pictures of the ISU side of the field looks totally red with some small areas looking purple.
From looking at actual closeup pictures of the stands and seeing the ISU crowd that we had at the pre-game rally at the baseball stadium, I tend to agree with Jamie and Matt that the ISU crowd would be about 30,000 if not more. And yes, I am an engineer, that's why I took zoomed in photos of the crowd at seating level.
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Is that the dumb hawk fans in the bottom left? Always one or two dorks who show up in hawk stuff.