If just 20,- Euros per month will really help you, I can pay this for the next year (PM me with a bank account #, if possible, so we can avoid the PayPal tax).
Some additional ideas for generating revenue/taking the project further:
1.) backlinks from a PR5 site (as froxlor.org is) are worth something. And as long as you dont overplay it, nothing bad will happen - BTDT
2.) people are much more willing to pay for something concrete. That's not only for psychologic reasons (if you get something in return, you can tell yourself that you have made a good deal. Also, seeing a concrete result as the consequence of your action is much more rewarding than just having supported the project somehow, without knowing whether it made a difference at all), but has also concrete implications for commercial enterprises: Paying for feature xyz is an expenditure ("Betriebsausgabe") and there is nothing a tax auditor can do about it. Donations, on the other hand, are much more difficult to get accepted.
3.) because of 2.), it would definitively be useful if one could "vote" for issues/feature requests with money
4.) another idea: getting enough donations to pay for a regular full-time developer will probably be difficult at this stage, except you find a really big sponsor. A much less expensive alternative would be an internship, provided you are willing and capable of overseeing that (there are some organizational requirements, and of course you also need someone acting as tutor). The advantage of internship is that you can really get something done in these two or three months, if you have a motivated intern. And the chance of getting something done may motivate people to donate (see 2.)...