Dear Vago
There are many color combination for internal and external walls but all are depend upon your choice. On gharexpert.com in construction section you visit paint sub section where you find lot of material about paint. some of link given below for ready referance
http://www.gharexpert.com/articles/Paint-1648/Choose-Colors-Different-Rooms_0.aspx
http://www.gharexpert.com/articles/Paint-554/Which-type-paint-best-suitable-exterior-walls--0.aspx
http://www.gharexpert.com/articles/Paint-535/Which-color-combinations-best-suitable-ext_0.aspx