I would love a component that blanks out a portion of the screen defined by the same controls as the free gradients use.
I am sure people have figured out a lot of ways to do this; I have my own - usually using a free gradient, blend, and alpha setting - but, it does seem to require more components than necessary and it seems like this wouldn't be too hard to do!

"A house in Beverly Hills
Your daddy paying the bills
A life of power and wealth
Beautiful...but it helps"
Pet Shop Boys, "Love, Etc.", Gui Buratto Remix