There is no limit for the imagination. Children could take part in design processes; favorite colours, theme, purpose. Safety is also an important issue to take into consideration. There are so many great fabrics to choose from. Wallpaper is possible to custom print of a photo or another favorite images. Also now wallpapers are easy to remove when taste changes and children grow.
A handy person could even create more unique designs.
What a joy it can be when a child sees their new room for the first time!