Thanks for posting! Exciting about your bedroom! The cool thing about the colors in Lilly’s room is that they all work really well with blue. I’ve pulled a few inspiration images below that show off the deeper, teal-like blue that could work really well to tie in the magentas, yellows, and grays.
As you can see from these pictures, this color blue works both as more of a main star (in which the walls are painted), or a supporting player (in accents like blankets, rugs, etc.)
I hope this helps inspire you! Good luck with your room!