Don't laugh - I've got a 3yr old who loves highlighters! It wasn't her though, she was too busy decorating my bed.
Love your lights, especially the Grown up lounge one.
Edited for spelling
Hehehehehe! I remeber when Mr 4 went through that stage, he decided that he didn't want a white bedside table and tried colouring it in black! Grrrr! Most essential piece of child wrangling equipment at that stage was the Chux magic Erasers!!
Your house is looking great! There was a lady there the other day vigorously cleaning the windows!