Check out the Show Off Your Dashboard thread. There’s some multipurpose examples mixed in with the smart home focused ones: Show Off Your SharpTools Dashboards!
For the cooking timer, what about embedding an online cooking timer? From a quick search there’s https://e.ggtimer.com/ and https://www.online-timer.net/ which seem ok.
For the TV integration, that usually depends on what the integration with the hub has. Sometimes there are community drivers and apps which add more features than the stock ones, but I’m not sure about Homey.
For the to-do list, you might be able to embed your to do list similar to the cooking timer approach if your to-do list has a web app or way to embed lists.