You can mine some altcoin and sell them for bitcoin. Most good altcoins are not profitable to mine if you have high electricity cost.
Any suggestions which I should mine as long as it's not going to be 1eu/month?
Well, exactly that. No-one knows the exact volatility of a crypto currency or we would all be millionaires if we knew something would make money.
As I have pointed out earlier in this thread. You have to decide for yourself what Crypto Currency you want to mine and what risks you want to take.
1) Read the exchanges and see what doesn't fluctuate much or what takes your fancy, maybe you want it to fluctuate.
2) Calculate how much you would be making per month with your hash power, take into account difficulty increases.
3) work out how much you would make off that coin, be conservative.
no-one will be able to give you the holy grail "mine this and you will make thousands of euro in a week"