Who knows how you did that? Who knows what “blocky” means?
Seriously, Angus, the only information anyone here has to go on is what you tell us.
If you tell us exactly what you did, what you were expecting, and what actually happened, perhaps someone will have a chance of helping you.
As for a site where you “can download a ton of materials…”, what is it you’re looking for? I seriously doubt there’s a ton of pictures of the outside of your house; however, if you open up the criteria a bit, there are millions of candidates.