There is a Photoshop group on subreddit. They often take pics and do all kinds of things with them. Of course, I hope these don't "get back" to those who are the topics like this viral photoshop of a little girl with an owl. And yet, this is also a concept we can apply when we teach PhotoShop.
If you need help picking colors that go well together, I love color schemer for that. You can use the RGB colors even in Microsoft office or you can use the HEX for websites, etc. I teach my students about colors but even if you don't have time for that, you can at least teach them to generate a color palette.
Take advantage of the natural affinity children have for comics and use them as a powerful teaching tool in your classroom. The following tips, tools, and resources will get you started.