Most of the comments in this thread are for apps, but if you like stickers (to put on your phone case or laptop), check out my side project — KP General Store! We have a few stickers, a dumpster fire magnet, and some coasters. Hoping to expand our products soon!
Use code DOUBLE to double your order for free. Today is the last day: https://kpgeneralstore.com/collections/stickers
We don't do custom stickers, but might in the future! There are a lot of sites that let you do that though: Sticker Giant, Sticker Mule, Sticker App to name a few. Hope that helps!