I think Mizzou has some pretty gorgeous houses...though I am definitely biased.
I've looked for pictures before but am too lazy to do it now.
However I think that Kappa Kappa Gamma, Beta Theta Pi, AXO, Alpha Kappa Lambda, and LXA/Sigma Chi (it's really Sig Chi's house but LXA lives there) have some of the most BEAUTIFUL houses I've ever seen. Beta, AKL, and LXA look like your "typical" fraternity houses with large white columns and lots of brick...I love them. And AKL is actually not TOO bad on the inside...or at least the first floor anyway.

The upstairs maybe not so much but that's to be expected.
Phi Kappa Theta also has a gorgeous house I think, as do DG, Chi O, and Theta.