I'm also looking for twin toddler boys room. I just ordered 2 toddler beds for them and I'm having such a hard time finding linen. The walls are teal color. I was hoping for a ship/see theme since they have a cute wall decor with a ship right now. But I'm open to any ideas that match the walls.
Depending on the shade of the walls you may be able to go with yellow as well. Or if you prefer, you can try a taupe/beige/neutral look and keep the walls as an accent color. Let me know if you want more options.