Agreed on wilderness and Dungeon decor.
I would love in addition to the already stated suggestions of 1x1 squares of chests, chairs, boxes, columns, tables, etc. if they also had stuff like: generic dead body marker (so you know where your guy is dying... cause when you push a mini over on its side, they tend to roll around and migrate on the board. Not surprisingly it always seems closer to the healer too). Along with generic weapon makers (so when your players are trying to squeeze every conceivable action into one round and start to drop weapons so they can draw other ones, you know where that weapon is on the ground... so the enemies can run by and swoop it up!)
And just basic stuff like that.
I'd also like to see round floor areas. The diagonal ones in the last Crypts and Temple set are a start.