I have a filter on my gmail so my phone plays the coin sound from Super Mario Bros. every time I get a Paypal/Etsy/Ebay/Amazon payment. It's quite satisfying to hear that throughout the day.
A friend of mine set up IFTTT so his phone would play a "ka-tching" sound every time someone paid for a premium account for his startup. The novelty never seemed to wear off.
We implemented something similar 5 months ago, but wired to an event in segment (we don't use stripe).
The bot would post a random gif from giphy tagged with 'money'.
After a while we became tired of seeing Nicki Minaj appear in our slack...