Eureka!

I've found the color for the garage!

Here you'll see four different colors: From the left, it's Sample #2, Sample #4, the door, Sample #4, Sample #1, and Sample #3.

Here you can see Sample #4 around the window.

I think Sample #4 is pretty close to perfect--just the right greyed-green, just the right medium-light shade. (Though I would like to see it in the sun--I hope it's sunny tomorrow morning.) Only problem is that it's a mix of Sample #1 and Sample #2, made by 2 different paint companies. So I'm hoping that, if I still like it a couple of days from now, one of the local stores that sells paint can mix up a match.