it's amazing what a little paint and imagination can do to transform something you thought was'ugly'
I love the garden or animal theme ideas- if your dd likes those things-
just think color wheel, opposites of green on the wheel,and you get a funky type room, similiar colors,and it becomes an oasis....
I just redid ds's new room, using leftover paints, just painted each wall till we ran out,,bright orange,stitch blue,slime green,with contrasting trim(green wall,blue trim,blue wall,orange trim,etc)
then to tie it in, I used the 'slime green' to create a Nick slime effect down the corner of each wall as if it's dripping into itself- for next to nothing, he now has a Nick slime room,and it came together while we were painting,we had no idea where we were going with it at the time!
Go to Home Depot and Lowes, check out their paint cards and ideas charts, something will strike you,and you can duplicate it without a lot of $$$