[loqi]

I quite consciously use "I feel like" to mark lowish confidence statements based primarily on fuzzy intuition or perception ("I feel like it's less work to move my eyes from side to side than up and down").

Contrast with "I think", which I think is more appropriate for statements with at least some deliberate thought behind them, or involve more concrete propositions ("I think Brand X hardware is unreliable", "I think it was last Wednesday").

So the author's example of "I feel like that would look better in blue" looks like a perfectly cromulent use of the phrase to me. If it's mostly a gut feeling about a subjective perception, why not use language that disclaims it as such? Apparently he feels that the disclaimer serves to shield the speaker from disagreement, but I'd have to disagree with him on that.