Install Gallery Script and Customise

Would like a photo gallery to show photos of a baby boy to family. Requirements: 1) Installation of a good image gallery script to my hosting account, it uses PHP and MySQL. 2) Customization of the script to give a good "baby boy" theme with nice blue colours. Please don't use any stock photos of babies, just a nice theme with colours. 3) Need the ability to password protect the whole website as people enter before they view any images. You will be provided with all login details to the hosting account which includes FTP, cPanel and phpmyadmin etc.