Intranet design should be more science than art. But an intranet redesign is not rocket science: less is more. If you undertake the research, or hire an independent intranet consultant to do so, employees will tell you what they want. And you can use the opportunity to test different design concepts and showcase other intranet designs.
A simple home page at a glance, with more links than pictures and colors. But not too many links, or too much text.
Less is more. Intranet design 101.