As I have admitted before, I love non-combat magic items. I also love 'variant' items where you take a classic item and change it a bit to make it fit your campaign better.
This is a magic items I came up with after reading the Secure Shelter spell many years ago; it is a variant of the Instant Fortress, of course.
Magic Item - the Portable Cottage: Unactivated, this item appears to be a wooden cube 1" on a side with the rune for 'house' on one face. When placed on the ground and the command word uttered it transforms into a well-made cottage. The Cottage is 20' by 15' on the interior with a large door in the middle of one long wall and a smaller door at the edge of one of the short walls. The interior ceilings are 8' high. The walls and floor are of dressed planks. There is a fireplace and hearth opposite the main door. The long walls each have 2 windows with heavy shutters and the short walls each have one similar window.
The Cottage is furnished with 2 bunk beds and a larger bed, a table and 6 chairs, a padded chair, a footstool, a large chest, and a side table. There is also a large bin for firewood and a water barrel. The bin can hold 1 days worth of wood for the fire and the barrel up to 50 gallons of water. When activated the large chest contains clean linens for the beds - anything else placed in the chest will be dumped on the ground when the Cottage is deactivated. Likewise, water may be stored in the barrel and wood in the bin - anything else is dumped on the ground when the Cottage resumes its cube shape.
Any living creature inside the Cottage when it is returned to its cube form must save vs. Wands - if the save fails they are stunned for 1d4+1 rounds and take 2d4 damage; if successful they are stunned for one round and take 1d4 point of damage.
If attacked treat the cottage as being identical to a large round tower for its resistance to spells or siege engines. If damaged the Cottage recovers one structural point per month is remains in cube form.