I do something similar for language learning, every new tab in Firefox shows a flashcard. If I'm in the middle of something I can ignore it but when my minds already wandering I tend to notice the word there, hopefully it helps.
The coolest thing about vision board desktop background is that I save them every two weeks or so and start another. I now have a folder of two years of my thinking in visual form that's easy to review in just a few minutes. It may be that this works for me because I'm a visual person and others need to write it down and rewrite it down often to learn it.