A blog I’ve more recently found is Albion Yard, one of the pages is called Fifteen Minute Heroes. The idea is that you only have 15 minutes and rather than say “I don’t have time to do anything” these are the types of projects you can do in 15 minutes or less.
Matt's Railroad Blog 
An inspirational blog post is another nice and quick little 15 minute project!
This is a bit off topic but I recall you were also working on getting JMRI on a Raspberry Pi? If I’m remembering correctly and it was you did you ever get it working?