here are some tips-
why dont you buy a canvas board and paint a girl (make it more pink)on it and get it framed,its cheap and will look great.
a board,hang it on your door and put anything you want ,make it more messy because it just looks awesome..
go to the craft shop, you can find large wooden letters there which are not too expensive and paint them pink and you can hang all over the room ,use your name-example - DRAMA QUEEN
see if you can find sale shops or second hand shops and buy a mirror,get it framed pink!!
have pink cushions,toys and clock(look in house for them)
to make your room more funky just hang anything you want..like take a string or ribbon and hang notes on it (use pink sheets)
use paintings around the house.
use pink bed sheets,pink curtains etc
see if you can find a pink furry carpet ,just use it and put cushions on it..
this is all i can think of..good luck!!
do you have old clothes,jeans etc. just have a old denim jeans and cut it,have some pink felt and buttons and do this (see in image) and hang it beside your study area.put pens,pencils in it.you have to sew for it. :)
do you have pink old fabric?make a pillow from it ..and add cotton,very cheap and looks attractive.(see in my photos if you can)
have a plant in your room,see if you can find one in garden or nursery and put it in pot and paint it pink!!
i told you that you can buy something from cheap shops that was my advice.if you want to know whithout buying just see around yourhouse because i don't know what you have in your house.
i said without buying things