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A windowpane or pinstripe could be fun, but be sure to balance it with the shirt, shoe style, and tie you're wearing, and maybe keep it more straightforward, so the brown shoes take the spotlight
If you want to stay on the safe side, but still crave some sort of extra color, you can experiment with different colored bow ties - perhaps a glittery red tie would be just the thing
Otherwise, take a cue from Taylor's performance outfit and go for a flowy, ethereal dress in muted shades of purple or cream
Best scenario: Your CEO speaker is personable, willing to answer questions, and willing and able to spend a little informal time with the students after speakingyour interns will be quite impressed