Symbol of hope

We have many people passing by our house, on foot, by bike, in their car, especially the primary and high schoolers on their way to the nearby schools. In terms of our lease, we cannot have any sign up at our house, so how can we let people know why we're here. Recently at a church service, a Japanese pastor sopke about how many people associate a cross with a church. That gave us an idea. Perhaps we could have a cross at our house, an inside "decoration" but visible from outside. So we asked someone from our former church in Otaru if he could make us one for the inside of one of the upstairs windows. We trust that as people look up, they might spot the cross in the window. At night time too with the upstairs light behind, it can be seen from outside.