This is the UI I created for the survival wizard game Citadel Forged with Fire. I wanted to go for a dramatic duo color setup and use red as one of the primary colors. This was challenging because usually red is used for negative things in UI but I think I managed to balance the colors right so I wasn't handicapped by this. I also did a lot of fun things with shaders in Ue4 to create some ambient movement in the UI.
Citadel Forged With Fire User Interface