Being a little more serious, I really like the first and third combination. It will look good with blue jeans and maybe a white shirt. If you have green pants I think the third looks great (I mean, green pants, light blue shirt) if you can pull it off (I won't). It seems it's not that difficult to wear although it will always be a little flashy.
Say you're wearing a pretty casual cotton unstructured blazer. Is it OK to roll up or cuff the sleeves if you're also wearing a tie? (And would the casualness of the tie, say cotton or linen, factor into the equation?)
It seems you do it wrong. You pick your suit, then pick your shoes, then pick your belt. Not picking your belt and then trying to see how to match things with it. If you do the later part, that means the belt with the logo is the central point of focus of your attire. In that case, it seems rather silly.