I couldn't find a slider for Manila that I liked, so I made one. I liked the Transparent Slider, but wanted a black-tinted one, so here is the product of my labour if anybody is interested.
Based on Transparent Slider found here and the stock black one.
Download ZIPs contain PNG and PSD of slider (for customisation), and CAB to install.
Tinted.zip - Plain tinted glass slider
Hole.zip - Tinted glass slider with feathered transparency in the centre (I prefer this one)
Screenshots can be provided if requested,. Tested only on Gen.Y Manila 2.1, might work on other versions. Cab file installs a CFC compressed version. Uninstallable.