Marker & supply holders
These are super easy to make just a box and toilet paper rolls. Paint and washi are optional for decorativeness.
Tp curtains or door curtains
These are really cool and all you need is time, string and tp rolls.
Tp roll reef
These are pretty simple all you need is tp rolls and hot glue.
Tp roll cord holders
These are really simple you just need tp rolls, and if you want, washi tape or paint for decor.