Uni project research - home bike storage -please help! I gotta do it by Wednesday

As a student with limited space i just deal with it and chuck my bikes wherever there is space(kitchen,bathroom, hallway). if i leave tyre marks on the wall i just use an eraser to get rid of them.
Also some rental properties like the places students live wont appreciate you drilling into their walls to fit a bike rack.

soapstone works a treat. thanks to Mechamorgan's dad for that one!