You can make a Beautiful Pallet Bench like this one. Its casual elegance would work both indoors or outdoors, and it is very budget-friendly too!
Use this Beautiful Pallet Bench to inspire you!
I made this bench out of a heavy-duty pallet. I angled the backrest a bit so it would be comfortable. I also made the armrests a bit wider, both for the visual appeal and for comfort.
I made this with relatively straightforward joints throughout. You could build a similar bench and wouldn't have to miter the corners if you didn't choose to. I sanded it smooth - enough to be comfortable, but let some of the original pallet charm (and paint) for interest. I think it came out very nice. It took me about eight hours to build overall.