I have a yellow saddle and handlebar tape on my Litespeed. I think it adds a bit of visual interest to an otherwise boring frame (in terms of appearance). However yellow can be a hard color to match shades properly, and you might end up with three widely different shades of yellow between the frame, saddle, and tape. Depending on how OCP you are, that may or may not be a concern.
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The rider in my avatar is David Etxebarria, not me.