"True Colors" (Cyndi Lauper)
"Paint It Black"(Rolling Stones), "Black is Black", "Back in Black" (AC/DC), "Black and White" (3 Dog Night)
"Mellow Yellow", "Yellow Subamarine" (Beatles), "Goodbye Yellow Brick Road" (Elton John)
"Blue Bayou"(Linda Rondstadt), "Blue Suede Shoes", "Mr. Blue Sky"(ELO), "Behind Blue Eyes"(The Who), "Blue Moon" (and any blues song around, I would think with the word in the title...;-)
"Red is the Rose" old folk song, "Red Rubber Ball' (The Byrds?) "Red House" (Jimi Hendrix)
"Purple Haze"(Jimi Hendrix), "Purple Rain" (Prince), "Purple People" (Tori Amos)
"White Room" (Cream? Eric Clapton, at any rate), "Whiter Shade of Pale" (Procul Harem), "White Rabbit" (Jefferson Airplane), "White Wedding" (Billy Idol), "Nights in White Satin" (Moody Blues), "White Trash Wedding" (Dixie Chicks. The mental image alone is enough to conjure ideas...;-)
"Pink Cadillac" (Bruce Springsteen)
"Brown-Eyed Girl" (Van Morrison)
"Green, Green Grass of Home" (Tom Jones?), "Bitter Green" (Gordon Lightfoot)
"Fields of Gold" (Sting), "Goldfinger" (Shirley Bassey)
"Orange Crush" (REM), "Orange Blossom Special", "Orange County Girl" (Gwen Stefani)
I'm sure there are tons more out there....