a couple months ago, I switched my free OF page from kind of a generic page where I'd just post my regular videos for sale to a foot fetish themed page where I only post foot/sock/pantyhose content. It's going a bit better than the generic free page did, but I can't say I'm making bank. As much as "selling foot pics to pay tuition" is a meme, in my experience, the foot guys seem to be some of the cheapest guys out there.
I have no idea if that is helpful, but I'll be watching this thread for ideas because I am not doing well in the foot arena, despite constantly being asked for pics (by guys who have no intention of paying for them).