How to cover up wall art?

i am changing bedrooms and the room i will be going into has a big wall which is painted with a scene of a football pitch on, i do not want to redecorate and cover this up as it was painted by my son but obviously i do not want it in my bedroom, does anyone have any ideas on how i can cover it up with anything that will not be permanent eg. drapes or has anyone got any knowledge of a online site that might give me ideas. thanks