This is what I put on the girls doors.
I just took the simple plaques at Joann's - I think they are like $2 a piece or something.
I took acrylic pains. Pink for Brianna - that's her favorite color, and Blue for Hayden because that's her favorite color.
Then I went to my awesome Cricut machine, cut out their names in vinyl and put them on. I did put a sealer over top of it because I didn't want it to peel off. Overall the project probably cost like $6 for both of them together - and overall took about 10 minutes of actual work time.