My own 50-90 challenge for 2018:
Everytime I pick up my guitar I tend to play something new. I try to just play whatever mood I'm feeling at the time. Usually whatever comes out is a one time thing, but occasionally something will stick and I'll use it as a launching point to write a song. This year for 50-90 I'm going to try to capture these riffs/moods/themes and post them raw. It'll be a fun experiment for me and hopefully some will later become songs (and hopefully some will be forgotten.)
If something inspires anyone to words, maybe it will inspire me back to revisit and expand an idea (collab?), but no promises because Summer.