I'm thinking a feature wall will be OK - at least it will make the room feel like their "own" if they have some input in the colour.
I have 3 boys - 8, 5 & 6 months & their bedrooms are all one end of the house.
Riley, who is 8 wants a green wall, Harry 5 wants dark blue (a month ago it was silver & black

So, are green & blue good bedroom colours? - Riley has trouble getting to sleep so hoping green is a restfull colour??
Not sure for a green, but like the look of Blue Oar from the Dulux colour chart. Figure if we get some sample pots & let them have a go painting on some board they will go with what I've picked out.
Then not sure what to use for Jed's room - does it need to tie in with the other 2?
Jo