To whet your appetite and keep your writing fingers limber, take a good look at the photo, or let a prompt settle in your mind. Set a timer for whatever a reasonable amount of time is for you, be that five, fifteen, or thirty minutes. Then start writing.
Tell a western story in an unconventional setting.
Explore your early experiences with horses. Do you remember the first time you rode? Did you love horses, or were you afraid of them?
Write a guide explaining how to tie basic knots. Do a little research if you’re not currently familiar with the topic.