It is transparent on the homescreen but in other apps it will become black again. The google experience launcher is Nexus 5 only but there are ones like it on the play store that you can install like any other app or if rooted you can find it around XDA and flash it
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Samsung Captivate - CM 11
AT&T Galaxy SII - SHOstock
AT&T Galaxy SII Skyrocket - DEAD
AT&T Galaxy S4 - Beanstalk 4.4 - MDL
MOTO G - Stock
COOK/HACK of BLiNDrom and T-motion RoM