mental ray and photometric lights = slower to render
standard lights and materials  = fast.

Make your own maps from found images. Go to places like this for inspiration

http://www.creativewallcovering.com/12da-ac030163b-wallpaper.html

Click around until you find larger images like these, & save. Do searches for wallpaper, wall covering, home decor, interior design, etc. You can find stuff if you look around.

Make a bump map if there is any texture [and there should be, even for a painted wall] ... remember white is raised ... do the work in Photoshop ...

The material must be made to tile, unless it is already tiled. This we do in photoshop. I found this one already tiled, good enough anyway for a designer in a hurry.

1 make a material using your found image in the diffuse slot

2 add your bump map to the bump sot

3 we will also need a specular level to make a nice light across the flat surface ... add either a noise map or preferably a gradient ramp to your specular level [not specular color] slot

you will need to tile both the bump as well as the diffuse image

the specular level gradient ramp will need work too ..

either change to planar to object xyz ...

... or hit the YZ button

light it in such a way so the secularity and bumps show off nicely. if that bump is too strong for you, pull it with the spinner in maps/bump..

btw that second wall map there is in the architectural maps folder in max.