Agreed. I only make internal tools where I work, and homogeneity is great here. These apps should be the most boring apps, yet clear, easy to use, and importantly, consistent across the company.

Bootstrap was great for this. You got a clean web interface that was simple, yet didn't have to be completely ugly. Basic and functional. A form to submit POs doesn't have to stand out, be glassy, or have animations. It needs to be easy to parse and stay out of the way.