During the first forty years of Eurovision's history, broadcasts would start and end with a title card mostly containing a circle consisting of twelve stars made up of lines with the letters of the word "Eurovision" put in between the stars. Variants and alterations of this exist throughout the years (See: 1954 Idents). In the middle of the circle, the logo of the originating broadcaster could be seen. The title card was accompanied by the prelude to Charpentier's "Te Deum". The logo was designed in 1954 by Timothy O'Brien, a stage designer at the BBC. This was the same year when Rai broadcasted for the first time the Sanremo Music Festival, which they presumably used this logo.
Despite being replaced in 1993, the logo is still referenced one way or another during the Eurovision Song Contests, mostly the interval acts, and modern-day variations of this are still used by broadcasts by and for German-speaking broadcasters (i.e. ZDF, ARD, ORF and SRF), replacing the current Eurovision ident.
As the EBU was expanding to the east during the mid-90s, they and Eurovision adopted a new logo. The participating broadcaster's logo no longer shows up on the intro.
Starting from the 2012 Junior Eurovision Song Contest, Eurovision unveiled a new logo and intro created by Dunning Penney Jones. The intro originally had the background changed color to pink and back to blue, but a tweak in 2016 saw the background color remained blue at all times, though the previous version was retained by minor Eurovision events, e.g. Eurovision Young Musicians.