How to make a cube that looks sketched?

[artiq]

I am wondering how you can make a cube in Photoshop that looks sketched? My reason is that I try to make a picture for a banner where there will be a box and a dot outside the box, referring to "Think outside the box".

 

[Nomission]

Draw a cube.
Goto menu "Edit->transform->perspective"

 

[Nomission]

You're right.
Draw a cube.