I'd say aim for a scheme of two or three colors and use a background/icons/pointers/etc that fit in well with it. Not using Rainmeter at the moment myself but it's lots of fun to dick around with for days on end. Grey/blue or white/black/blue as in your avatar would be a good theme, then just find a desktop image that conforms to that. Hebus.com is a great site for desktop backgrounds, especially if you like abstract, though I would recommend an ad-blocker.
Your taskbar is horrible, if you want to use Windows' classic Start Button, shrink that fucking taskbar (Toggle small icons) and you should probably pair it up with classic Windows' wallpaper, otherwise, you need something more simple to avoid clashing with the no non-sense design.
Furthermore, you should swap icons, they are clashing with the UI and hide some of them.