I also heard it with reference to color, but that sounds okay to me. Like, the color is "greenish", do describe something between blue and green or between brown and green to say that it has a hint of green or that it's kind of green but not completely, you know what I mean?
But 'coolish' and 'aroundish' sound awkward to me. I think it is better not to overuse it, it sounds annoying to me like this...