I made the “Summer Treats” pattern using “Image Tricks” (BeLight Software). It’s an app designed for Macs and there’s free version that lets you make magic with existing images – and also generate new ones.
Here’s their page: https://www.belightsoft.com/products/imagetricks/
I’ve been using “Image Tricks” for years and have found it to be robust, easy to learn, and packed full of very cool features. Have you ever tried it?