I’m looking for really bright ones, Im a girl but Im also with my boyfriend so something bright, colourful but neutral if that makes sense. We both like orange but any bright colours would be nice, just not pink haha
http://www.urbanoutfitters.com/urban/catalog/category.jsp?popId=APARTMENT&navAction=poppushpush&isSortBy=true&navCount=21&pushId=A_DECORATE&id=A_DEC_BEDDING
My favorite store.. there tapestries are nice to throw over your bed in the summer … I love em own many they go on sale for ten dollars all the time 
You can find duvet covers in most department stores (Macy’s, Sears, JC Penny and the like) and don’t forget to check their web sites because they sometimes carry more merchandise than the stores do. Discount stores like Home Goods, Tuesday Mornings, TJ Maxx and Marshall’s often carry duvet covers. You may also want to check Overstock.com.
If your search nets you no results, another option is to have one made out of two flat sheets. Sheets make a fantastic duvet cover because they wash so easily and add almost no extra weight to your duvet. Making a duvet cover is ultra easy as you will just be making one huge pillow case with buttons, a zipper or velcro sewn into the bottom hem for closure. If you cannot find sheets, there is always a fabric store where you can find lots of choices to make your own duvet cover.
References :
http://www.urbanoutfitters.com/urban/catalog/category.jsp?popId=APARTMENT&navAction=poppushpush&isSortBy=true&navCount=21&pushId=A_DECORATE&id=A_DEC_BEDDING
My favorite store.. there tapestries are nice to throw over your bed in the summer … I love em own many they go on sale for ten dollars all the time
References :
You should go to IKEA if you have one around your town. They have plenty of colorful duvet covers. Go to their website.
References :
http://www.ikea.com/us/en/catalog/categories/departments/bedroom/10651/