Re-doing my room help pleeaseee?

alrighty well i was thinking about redoing me room but i want it to look nice and i'm not sure of what colors to do. i like these polka dot comforters http://www.pbteen.com/products/dottie-duvet-cover-and-sham/?pkey=cgirls-duvet-covers but i don't know which color would look good with my walls i will be painting. could someone pick a comforter ( doesn't have to be the polkadot ones but i really like those!) curtains and then a wall color? thanks! :D