Given the choice between building a cliche project and something a bit more off the beaten path - you may as well put a few extra days of thought into a project before you start, and come up with something unique (as long as you don't spend all your time thinking and none of your time doing).
The problem with the ideas listed is that they're obvious - both myself and my friends have talked about/wanted to approach almost every single one - but it's not obvious how to actually build a better mouse trap for each of them. It's useful to realize when you're trying to attack a generic problem (that has already been solved) with an equally generic strategy.