Maybe this goes beyond stating the obvious, but making French toast gluten-free isn't that much different than making it the "normal way." Stale bread, eggs, milk, frying pan, and done. Maybe some cinnamon sugar and fruit if you're lucky.
I don't know about you, but my best ideas come to me when I'm staring at the fridge. It's like the ideas that come to you in the shower, or right before you go to bed. Mine come to me when I'm standing there, letting all the cold air out, absentmindedly surveying its contents.
Remember that bread I made? It was amazing right out of the oven, but then it dried out pretty darn quick. I avoided using it, and then one night I was staring at the fridge, wondering what to make for dinner, not really wanting to cook but definitely not wanting to go out to eat either. And then the lightbulb went off in my head - French toast. Quick and easy, and a great way to use up stale bread.
I added some honey, vanilla, and cinnamon sugar to the egg mixture. The best French toast in my book has lots of cinnamon sugar, so I sprinkled it liberally over the toast when it was done too. And the last of the raspberries from the freezer graced the top (and their juice combined with honey made a great syrup).