You can get "removable adhesive" two-way tape and all types of colored felts from Michael's. Use two-way tape that wont leave a residue. Lowe's and Home Depot definitely sell a two-way tape that painters use. I forget what its called, but I remember it wont leave residue.
You can also buy the foam strips used to seal around window unit AC's. Just dont use its adhesive. It more than likely will leave a residue. Stick it to the two-way tape and let the tape do the adhering.
You can also buy the foam strips used to seal around window unit AC's. Just dont use its adhesive. It more than likely will leave a residue. Stick it to the two-way tape and let the tape do the adhering.