Do this ... to your neighbors!
»whimsical with slightly serious tone«

Solution

The whole thing is a cardboard sleeve (single or double folded) with a low priced 2-colour printing.
The double folded version includes a photo as a view through a spyhole  -  band or neighbors   ;-).

Other entries in this project

The Yugos
G_Sasha
50
16
7.29
focus
bbbfg
11
17
7.25