Need help with creating custom look and feel of our existing EBS 12.1.3

Hello All,

    My organization is looking into changing the look and feel of our existing EBS 12.1.3 and during Collaborate19, I found one company who provides that kind of service. But I was wondering if anyone of you are using any contracting company or have created inhouse custom look and feel and can guide me to some easy to follow documents or the company that can help do it for us?

Thanks