I create also other things, not always related to engineering. This allows me to explore new opportunities, which I could use later, in real work.
For this I used open-source software:
Why set like this instead Photoshop, Corel, or 3D Max? First, these programs work well on Linux, which I use every day. Secondly, they are light and fast. Third, I can use them anywhere and anytime (free license, easy to install, portable versions).