Hi!
I have an idea on donations - as not may people are reading forums - place a top header banner in KLOXO itself asking for donation, which would be visible only for admin account. (You can also code another menu item in the list - "Donate")
Other source - register with hosting providers , get your refferal URL for selling hosting - and make those visible on your forum with a link from KLOXO header . So that people ordering new hosting could use you as a refferal, that would mean the price would stay same for them, but you would get some $ /per registration or even from monthly payments.
Not to be too intrusive, you can also code a box which would allow admins to hide the ad , until you ran out of money