Shaperbox 2 is a great value and surprisingly powerful. It definitely makes some things I used to automate now take only seconds to set up. Highly recommended. I was able to upgrade from v1 to v2 for something around $30 I think - they’re a good small company, too!
I love slowing a melody to halftime and mixing it to the original to taste. Then automating a few subtle filters and other effects. Can really spice up a melody and get ideas flowing.