Hi - here are some ideas for your room, but one thing I would say if you keep your posters of The Vamps is to put them in frames and just have them on one wall and group them together - you need to make a statement with these, not just sticking them on the wall and on all your walls :) You will find that this way they will look really nice rather than just posters stuck on a wall.

https://www.google.co.uk/search?q=retro+...

Look at the pictures and decide first of all what colours you like. Then choose your bedding. I love the reds, oranges and yellows together (look at the picture below) - they look very fresh, bright and clean colours. Perhaps you might like just one feature wall - which would be the wall that your bed goes on and have another colour for the rest of the walls. Just a little tip if you decide to go down that road and that is - your feature wall should be the darkest wall and the rest lighter. i.e. If you use these colours I would suggest your feature wall be Red and the rest of the walls perhaps a lemon - have a look at these :)

Red

http://www.benjaminmoore.com/en-us/paint...

Lemon

http://www.benjaminmoore.com/en-us/paint...

You could have red or yellow bedding - perhaps something like these - if you choose red then go with a yellow cushion on your bed - if you go with yellow go with a red cushion on your bed - to 'tie-in' the colours.

Bedding - I like this with the grey added - also if you chose this bedding then choose something similar also for your bedside lighting with the yellow shades, but obviously a table lamp not a tall one.

http://www.bedeckhome.com/altuza-citrus....

http://www.ebay.co.uk/itm/REVERSIBLE-STR...

A few more ideas :)

http://www.housetohome.co.uk/room-idea/p...

http://homedesignlover.com/bedroom-desig...

You will note that all the bright colours are very funky for your retro style :)

Well, I hope this has given you some ideas and good luck with your room and have fun :)