As Matthew says, many people may have their own laptops. Obviously, this depends on the university. I know of universities that make laptop ownership compulsory. Perhaps you could comment on how common it is for students to have their own laptops and bring them to the university. So you should think about what kind of value you can add for such people.
One possibility is to have laptop docking stations available. Or if not, at least have external keyboard, mice, monitors available that can be plugged into a laptop.
Nice big good-quality monitors (26 inches or larger) are a good idea, and are not that expensive these days.
Good ergonomics is a must. Buy the best workstation chairs you can. I have the Steelcase Leap, which is not perfect but a decent chair. Keyboard trays are probably also a good idea. Humanscale is popular. Of course, there are many other brands, depending on location.
Adding some whiteboards around the room would also be reasonable.
If you are keeping actual computers in the lab, then consider having computers running operating systems different from those students may have encountered. Encouraging people to use the free Unix-like systems that are now common in scientific enterprises is a good idea. E.g. the systems based on the Linux kernels, the various *BSD systems. If such systems are already widely used in your university, this is probably unnecessary.