If you've just leased a space for your new cafe, and you and your partners are looking for ways to decorate it, then you're probably tired of drywall. You can paint it, and hang up some prints, but this is still going to be a bit boring. On the corner spaces, you can bring in a carpenter to install decorative moldings, but you will still be left with the large, blank canvas of drywall.
Faux-Wood Paneling or Waist-Height Wainscotting
If you want a wood theme for your cafe, then you should bring in a designer who can install faux-wood paneling or waist-high wainscotting on the walls. The faux paneling is not as heavy as real wood, and it can be attached right over the drywall. The benefit is that it has the same look of real wood. You can get an imitation pine, if you like the light blonde color, or you can go with mahogany if you prefer dark colors.
If you think that wood is a bit too "heavy" a look, you can go with a European-style wallpaper. These are really excellent if your cafe is supposed to have a bistro feel. The wallpaper is a great way to get a decorated look on the walls without having to clutter them up with lots of little posters and photography.
If you have a really small space, then you should consider having a huge floor-to-ceiling mirror installed. The benefit to using this is that it will create the idea of more space. So, if you have a long and narrow space, this can help make it seem less claustrophobic.
Thin Brick Panels
If you want the classic look of a brick facade, but your landlord isn't too keen on you tearing down the walls and trying to expose the old brick, then opt for a simpler solution and get thin brick panels. These can be attached to the interior walls and create the same look and feel of real brick. They will have the texture, grout, and shading of brick. If you want to really make the place look cool, you can get a brick paneling that has been created to look "aged" with some bricks a bit darker or more pitted than the others.
If you were to get permission to expose the brick wall of the building, you would have to tear out the current drywall and insulation, possibly cut studs, and re-stabilize the wall. Plus, there is the problem of having to deal with moisture and dampness from the original brick. A thin brick panel attached to the interior drywall is a much better idea. Talk to a company such as The Best Panel Company to get such panels.