I don't know how easy or not this is but I would like to at least have flowers appearing in blueprints, I like creating flower patterns and it is annoying not being able to blueprint them around but having to build them from scratch every time. Other terrain would also be welcome too (for instance if I like a mountain and want to move it closer to my village )
My main suggestion thus is to introduce a new Blueprint (maybe called Terrain Blueprint or something like that) able to include terrain, maybe even only be able to include terrain.