I'm getting dizzy and these hurt to look at! Whats going on!? Two things: vibrating colors and pattern. The image with blue and red contains colors that are discordant. That means they don't really "match" and are similar in value. So when placed together they clash wonderfully and make "vibrating colors". The pattern only adds to the confusion. The pink and red image has matching colors but the same wave pattern. Both are painful to look at.
But good can come from this. I made a new desktop image. It's quite nice. have a peek: