The Stickies app on the Mac goes back to System 7.5, believe it or not. And though it remains a part of OS X, I can't imagine it gets much use. Nonetheless, if you happen to be one of the few and the proud who still use Stickies regularly, you'll likely find this tip rather helpful. I'll even go out on a limb and say that this tip is so helpful that it may even create new Stickies users.
If you'd like to transform any piece of selected text into a Stickies note, you can do it all without having to resort to good ole' fashioned copy and paste.
Just select any piece of text and press Command + Shift + Y. A new Stickies note containing the text in question will appear right before your eyes, even if the Stickies app isn't yet open. It's worth trying out as this is a nifty little tip to help you write down, with minimal effort, any thing you want to save for later viewing. Note that this tip works on any selectable text on your Mac.
If you really want to get into a Stickies state of mind, you can turn any Stickies note in the foreground translucent by pressing Command + Option + T.
Also remember that Stickies houses more functionality than you might initially think. Not only can you drag photos and videos to a Stickies note, but you can ensure that particularly important Stickies notes always stay in the foreground by pressing Command + Option + F.