If I’m ever unsure of what to wear I go with the same but different approach. Last Wednesday I wore a pair of maroon pants and a light pink sweater. The colors are similar but different. It’s not as easy as a monochromatic look but it does take a lot of the effort and energy out of the process first thing in the morning.
Here are some other color combinations you could use:
Navy blue pants with a sky blue top
Khaki pants with a champagne colored blazer
Black pants with a charcoal colored top