If you're looking for an abstract splash of colour to spruce up your desktop, the collections here should have something that catches your eye.
Over at the design blog Hongkiat, they have assembled two collections of really colorful wallpaper. One is a collection of 30 wallpapers based on the colour spectrum and another 26 wallpapers based the previous topic and aurora-style abstractions. Almost all of them are available in full and wide screen resolutions, but there isn't much emphasis on multi-monitor resolutions. Many of them could easily be tiled across multiple monitors without looking odd, so it's worth a peek even for the multi-monitor crowd. If you'd like to keep things fresh with your new wallpapers, check out previously reviewed 100dof Wallpaper Rotator. 30 Impressive colour Spectrum and Rainbow Wallpapers 26 Gorgeous Aurora and colour Spectrum Wallpapers [via Gizmo's Freeware]