How do you stick something to a wall without ruining the paint?

[Rudey]

How do you stick something to the wall without ruining the paint?

Here is why I ask. I want to take something like clock numbers like this and stick them randomly on my wall in a pattern I consider art-noveau (but not new-age) and then put the clock mechanism in the middle (again on the wall).

So anyway, I want to stick all this stuff on the wall without ruining it. Help if ya can!

-Rudey