There are cute t-shirts, books, lunch bags and even backpacks available.
For personalized invitations we would suggest searching on places like Etsy and eBay for a range of custom Sheriff Callies Wild West party invitations.
DIY Cactus Centerpiece For a Sheriff Callie centerpiece follow this video tutorial by Mister Maker to make a bubble wrap cactus plant.
You may have to make a few adjustments to have it shaped slightly more like the Sheriffs hat but the walk through is really useful.
The thing about trail mix is you can make them savory or sweet which gives you options.