Who did? Tony Blair? George Galloway? Jean Charles de Menezes? General Pinochet? Postman Pat? The Emir of Kuwait? Bod? Pootle? Tinky-Winky? Professor Yaffle? Lionel Blair? Fred West? Harold Shipman? Bruce Forsyth?
What colour? Blue? Red? White? Green? Pink? Grey? Purple? Turquoise? Aquamarine? Yellow? Beige? Black? Brown? Orange? Lilac?
What effect? Swirls? Circles? A M�bius strip? Squares? Truncated triangles? Six-pointed stars? Knobbles? Pointy bits? Gravelly texture? Ripples? Single-photon interference patterns?
You'll have to be more specific with your question.