Now as a disclaimer, this is not a fancy, brain-busting method - but it works for me so far. Not to mention, its pretty cheap compared to a ready-made vanity mirror. Here's what I used for this 10 minute project.
1 Mirror (Walmart ~$12)
1 pack of globe string lights (Target - $12)
Masking tape (Anywhere - $2)
1 Wireless Remote (Amazon - $15)
Also, since I'm far too lazy to plug and unplug the lights whenever I wanted to use them, I 'installed' a wireless remote. You simply plug the lights' outlet prongs into the remote receiver, which is plugged into the wall outlet. This step is of course optional, but it makes things a lot easier.
And there you go! A lighted vanity mirror for about $40! Not too shabby, right?
Thanks for reading!