At least in my country, in the week just after christmas, in several children cable channels, the ads dissapear. Instead the run "ads" for other shows in the channel.
In Israel, cable/satellite company-owned channels only ads shown for other shows or channels. That's not because they're nice, but because they're legally barred from showing "real" ads (only commercial, free OTA channels can do that; gov-owned public access only shows ads for their own shows, same reason). Plus those ads are just between programs and never in the middle of one. They still get very repetitive, though.
I guess that how TV without ads would look like.