I guarantee you won't be painting over it or I will come and help with the white job!
Then get other people in the congregation caught up in the plan and get lots of people involved in the job - its contagious! There is safety in numbers. I held a couple of info meetings, went to every adult SS class and women's meeting to share the vision - take puppets and popcorn and art supplies to get across the idea.
Have pictures of other churches to show what others have done. I gave a different church group a room to "do" with a plan and a budget. In this way, we got much more done than the budget would have allowed through generous donations.
Make sure the job is supervised and neat!
At kick off, have a big splashy event (we had a congregation hot dog/ice-cream lunch after worship) and invited everyone to a tour with hostesses in each room. Everyone LOVED the change. It was exciting. You would have to be a party pooper to object when everyone is ooohing. The older folk especially thought it wonderful for the children.
Just some ideas.... Catherine