Your tiles seem to give the impression of hot-country villa sort of thing; the palm trees, vibrant grass and cold-looking buildings all suggest this, and I find this really cool. If you were to make an Egypt- or something like that-based hack or RMXP game, these would be a perfect choice.
Regardless, I do think the grass is a bit too vibrant. I mean, honestly, one of the variations is almost flourescent green, which is not a desired effect when tiling - there are meant to be background, and blend in, and not stick out, as if it were in the foreground (which would be buildings, long grass and events).
Contradicting what I said about the light, hot-country sort of feel that your tiles have, the singposts seem like they belong on a gloomy, London backstreet or something. The base colour is far too dark, unfortunately. If I had to give a number rating, I'd give you a 7/10, but numbers don't really mean anything, now do they? :)
