TapGuid

TapGuid offers an easy way to create, send and share GUIDs on your Android smartphone or tablet. A GUID (or UUID) is a globally unique identifier, a large number that is unique across both space and time. Easily copy any GUID, or share it with other apps (try messaging a strange string of digits to a non-geek friend or family member). For each GUID, TapGuid fills the screen with a different color shade, that is computed from the value of that ID!