Some of these ideas are just awesome. I would love to have the following especially:
Curtains (varying sizes and colors)
Borderless water squares
Borderless panes of glass
Windows that see into other zones
Fish plushie that looks like swimming fish (fishing node style)
Seeds that you can plant in your house and then harvest from them (What a cool idea!)
Servant plushies
Doors that only trusties can open
The ability to restrict a pet to certain rooms
The ability to turn off certain item behaviors (such as the popping scare crow)
The ability to actually use the furniture in the house, or at least have character plushies that can be sitting or laying down on things. (One of my characters has this great spa, but it's completely empty of patrons! Doesn't inspire much confidence in her business does it?)
Also, staircases. I know we all make stairs out of numerous different things, but it would be nice to have a nice set of stairs as an item too.
Some things I haven't seen anybody else ask for yet (though I couldn't read through all these posts on this thread, so it's possible somebody has):
Rounded mounds of grass that do not have the butterflies/fireflies on them, or the ability to turn that effect off of those items.
Rounded mounds and flat squares that look like dirt, just plain soil for planting or fresh graves or stuff like that.
That's all I can think of at the moment, but this seems like a good list anyway. hehe 