Also gonna have a lot of beatles decor and memorabilia in it. 
If that helps at all, probably not hahah
Being as I was a teenager in the 60′s and a hippie college student in the 70′s (and was a huge Beatle fan from 1964 on) i can tell you that burnt orange, bright purple, sunshine yellow, lime green and turquoise blue were favorite decor colors of those decades. But, since we mostly lived in rented apartments or dorms. most of the wall colors were "landlord beige" or white and we covered them with posters or wall hangings which were mostly either tie-dyed sheets or paisley Indian cotton bedspreads. British, American and peace symbol flags were popular wall decor too. Also large cutouts of giant flowers and rainbows. In one apartment where I was allowed to paint the wall (the University owned the building and was going to tear it down the next year) I painted a mural of the cover of the Yellow Submarine album. In my teen bedroom you could not even see the walls because they were so covered with huge Beatle and Rolling Stone posters and hundreds of Beatles bubble gum cards! (yes, there was such a thing.)
old wood or fake wood panneling would be completely perfect! thats how alot of homes were back then and it would look perfect with the beatles stuff! =]
References :
Purple…I have always found purple to be a very retro color. I would also place a disco ball from the ceiling.
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If you want it authentic and not stereotyped, go for a warm beige on the wall and have the colours come from your art, furniture and accessories. Something like this?
http://farm4.static.flickr.com/3117/3186493172_f254a32289.jpg
References :
Being as I was a teenager in the 60′s and a hippie college student in the 70′s (and was a huge Beatle fan from 1964 on) i can tell you that burnt orange, bright purple, sunshine yellow, lime green and turquoise blue were favorite decor colors of those decades. But, since we mostly lived in rented apartments or dorms. most of the wall colors were "landlord beige" or white and we covered them with posters or wall hangings which were mostly either tie-dyed sheets or paisley Indian cotton bedspreads. British, American and peace symbol flags were popular wall decor too. Also large cutouts of giant flowers and rainbows. In one apartment where I was allowed to paint the wall (the University owned the building and was going to tear it down the next year) I painted a mural of the cover of the Yellow Submarine album. In my teen bedroom you could not even see the walls because they were so covered with huge Beatle and Rolling Stone posters and hundreds of Beatles bubble gum cards! (yes, there was such a thing.)
References :
old geezer Beatle fan (saw them live in 1965!)