Thanks for the answer :) yes i used some of them to build a garden, but the problem is i can´t place most Trees in there cause they "can only be build on terrain".
Well, I´ll guess this is not high priority so i will just work around and hope it will be fixed somewhat in the future :)
Thats the question, is the grass tool not working on sand lots, or am i doing something wrong? I tried with shaping the same tiles over and over, with none key, with shift and with ctrl. It always let me pay some money (actually my testing did me cost ~ 300 $ now) but nothing happens. I would...