Here is a bunch of fun Photoshop tutorials:
https://design.tutsplus.com/articles/50-great-photoshop-tutorials-for-clever-beginners--psd-785
Photoshop Merge
Here are a few tutorials to challenge you to make a Christmas card...
https://youtu.be/_WKeXCkl2zQ
https://youtu.be/T62a5CuAYLg
https://youtu.be/H1lGBm_x0Mk
Sparkle Star Effect in Photoshop
Sparkle Star in Illustrator
Confetti Brush