this screenshot is with composite enabled (true transparency).
desktop resolution of 1920×1200 scaled to 1600×1000
the term window on the left & right are mrxvt with trans enabled (Mrxvt.opacity: 40 & Mrxvt.opacityDegree: 75)
mplayer is playing thx-1138 behind the term on the right and firefox.
shadows are enabled in e16 (blurry) to add a better look