Your place definitely sounds like an area the Faery enjoy alot- especially with the large windows and big garden :-) From many testimonies I've read, many have seen them appear as blue light.

I've seen a sparkly PINK comet-like light zoom about in our back yard- and over the apple tree near my faery's garden as well-- I'm wondering if it's just what color these Beings CHOOSE to appear in-- it seems to be a part of their energy field that our human eyes can pick up.

In whatever case, I agree with Vicky and Berry- I would definitely ask them-- speak to them and put out something for them as well as a sign of kindness and respect towards them.