Bathroom Ideas!?

Ok guys..I need to redecorate my bathroom! I live in an apartment and the bottom half of the wall is yellow tiles (dull yellow) and the top half is white walls (dull white) my toilet is yellow (with a white toilet seat that I bought) and the sink and tub is yellow. Any ideas? Thanks.
I don’t think i’m allowed to paint but i’m going to ask if i can paint the dull white walls a brighter white.