If you don't care what it looks like, stuff them with insulation batting and mask over the hole with tape to seal off any drafts.
Conical 1 - Just cleaned out.
Conical 2 - Empty
Carboys - None
Secondaries - None
Lagering in Kegs - Bavarian Dunkel
Kegged: Belgian Dirty Blonde Trappist Ale, Forbidden Fruit IPA, Double Chocolate Stout, Bourbon County Stout, BLC
Bottled: Oaked Bourbon Porter
Planned: Looking for ideas