My experience is that you need to experiment with batters, for some of these pans. I would suggest trying the recipes at the Nordicware site first, because my bet would be that they develop batters that will take the impression well.
I have the Pumpkin/Vine loaf pan, and my first attempt was disappointing - the batter I used was too ‘soft’ to create much relief in the design:
Good suggestion.
I don’t have a picture, wish I did, but my friend baked 2 bundt cakes and cut them in 4 halves and arranged them in a cookie sheet and frosted them and decorated it to look like a big monarch caterpillar. Looked fantastic.