In regards to the swearing thing: I'm not a fan of any kind of filler words(It just makes people sound unintelligent IMO). A tactical F-bomb can have a lot of impact if used correctly, but only if it's used very sparingly.

As for actual advice, make a few different variants of any given tile so as to make different sections of levels fairly easily distinguishable(For example, light walls, dark walls, crumbled walls).
And remember that a level doesn't have to look any good while you're making it, as long as it looks good when it is eventually released.
Also, if something is going to fail, make sure it fails fast. Better for something to fail after a couple of hours' work than a couple of days' work.