There are these things called Magnetacks that will hang up your carpet without damaging it. They use magnets so they don't actually puncture or damage your carpet in any way like tape or thumbtacks would.
A pocket of heavy cotton is sewn onto the back across nearly the full width and a metal rod is threaded through it. The rod attaches to brackets on the wall. You should not use point fixings like rings as the weight distorts the carpet.
To clean wall-to-wall carpets.
One can find large selections of wall to wall carpets from a number of retailers. They can be found from The Home Depot, Carpet Warehouse, Houzz and Galaxy Carpet Store.
The ceiling.
Sure, you can hang wallpaper even though it is raining. You're installing it on an inside wall and not on an exterior wall in the rain.
Per Vastu, the right direction to hang a wall clock is on the north wall. It should face to the south or east wall.
Apparently some carpets release something called VOC's which are not so good for you. From my understanding this is really more from machine made and wall to wall carpets, not oriental hand knotted rugs
On a wall
A wall fountain!
bob saget
repaper
you can simply spray it with lysol or wash your wall with soap and water be sure to cover your carpets if you do this also you can spray it with air freshner after washing your wall
With a device called a carpet beater. You hang up the carpet and hit it repeatedly with the carpet beater to knock the dust out of it.