I grew up in a busy home with a breakfast banquette, and have always looked back on it fondly. We could always pack in an extra guest at the table, and it was much more comfortable than the rigid seating I have in my own current home. With those fond memories in mind, I am in the process of rearranging my home in order to make room for a banquette, and have been pleasantly surprised by the number of creative DIY options out there.
If you're looking for inspiration, be sure check out the post by DIY masters, Aubrey and Lindsey, to see how they turned IKEA cabinets into their banquette (picture 2).
If you're looking for more comfortable pre-made options, check out the benches available at Ballard Designs. Or, for a more flexible option, you could simply pull a settee up to the table (picture 6).