I was wondering.... and this would be possible in both texture packs (Fed's and Djipi's) that the backgrounds in the Hyrule Market, Link's house, other people's houses, etc are prerendered textures, aren't they? I mean, they are textures in the end so they would definitely be able to be changed, right?
I suppose those ones must be extremely difficult to retexture because of the high detail in them (not to talk about making them look cell-shaded).
Please correct me if I'm wrong, but finally changing the blurry market place into a crisp looking one would be the best improvements in both retexture packs