The lighting fixture will depend on the size of the room and the amount of light desired in lumens per sq ft.

For example - if the room is 20' x 20' and you wish to have an approx lighting level of 20 lumens per sq ft, the requisite output is

20 * 20 * 20 = 8000 lumens to be produced by all the lighting fixtures.

Another consideration is the number of fixtures as having all the light coming from fewer fixtures would imply using brighter light sources which could be impractical for the following reasons

1. Difficulty in getting the lighting fixture and bulbs in the desired size and style.
2. Higher price as the light output and input wattage increases as the increased heat has to be dissipated.
3. Concentration of light around the fixtures instead of having a uniform distribution.

Possible alternatives -

1. Augmenting the wall mount lights with either table lamps, floor standing torchieres (CFL or Led).
2. DIY cove lighting - light strip laid on top of crown molding. There are many vendors, for example flexfireleds, phantomlighting