Gift Ideas for In-Laws

We are going to visit the in-laws next month and I am looking for outdoor gift ideas for them.  We've bought them garden fairies and made homemade stepping stones with all of our kids' handprints in them.  They have statues and a water fountain already.  I am looking for other ideas for their rural setting like perhaps garden windmills or something like that. They come in different colors so it'd be easy to match their house. 

I have no idea.  Gift ideas for the in-laws are getting more difficult each year because they buy what they need when they need it.