The J.Crew catalog is one of the best sources for accessory inspiration. They make me fall in love with the weirdest things. A few months ago the catalog had these black acetate frames that reminded me of my sixth grade science lab partner but somehow looked so cool with a simple outfit and high heels. It's an 'I'm wearing four inch heels, but secretly low maintenance - just look at my bad taste in eyewear' look that can be achieved with your basic closet essentials and a pair of thick plastic frames.
One of my cheap thrills in life is ordering glasses from Warby Parker's home try on program, wearing a new pair every day for a week with experimental shades of lipstick, and then shipping them back all for a grand total of $0. (It's crazy, they will ship you five frames for free with a postage-paid box to return them when you're done. But beware of the home try on trap: you'll end up falling in love and suddenly your collection of corrective lenses is out of control.)