be careful with floor uplights. the result is often unusable, as you get a lot of glare - look down and you see right into the light. you'll need to fit narrow angle lamps, and I'd suggest the kind that have the lamp set into the fitting, so you'll see the lamp if you stand right on top of it.
the other thing to be careful of is heat. lights will get hot. hot lights can burn tiny feet without shoes/socks on, and you don't want that. as well as hot lights setting fire to something placed on top of them.
wall lights might be more practical. maybe white light from some wall uplights, and coloured cove lighting.
brown walls...hmmm