It could safely be said my whole house is zecher l’churban!
Seroiusly, we left a patch unpainted and in general, when we pick up minor nicks and scratches (car included) we leave them as is, zecher l’churban. That part is not halacha, but its our way of living with a galus mentality.
P.S. – I’m with you on the chicken vs. salmon steak, but rules are rules so chicken is out and fish is in. But I did make a huge personal sacrafice in keeping with the 9 days mourning idea; I’m not biking till after tisha b’av. Again, not halacha, but just a personal extra to show Hashem I’m trying to have this period not business as usual.