I was thinking of what you said the eula changes and looking for cosmetic perks for donations so here are some ideas.
1. Offering emerald or diamonds a myst craft World . This is easy to do with an admin creatively creatign a few and checking them out ot make sure they are stable first. Then keep the stable ones stashed away and deleting the unstable ones from the server directory.
2. Either for a certain rank of donor or even better make a kind of prize were the top donor for a month bet a towny plot bonus like 50 plots or something .
These are cosmetic perks as they offer no advantage over other players other then a personal recource world to devistate instead of tearign up the world. and a minor protection boost to a townys build.