This BG is seen in Bazza's Blocade. You can:
-view the sample in the .mwl.
-see it comes with colors for the boss version.
-notice there are 2 HDMA files, 1 for regular levels and 2 for boss or intense levels.
- these HDMA files use the Scrollable HDMA Gradient. Download it there.
I approved it, but you should have told that these HDMAs needed the Scrollable HDMA Gradient library. If something needs another resource like a patch or uberasm to work, you should put in the description.
I fixed the palette of the original bg, since it was incorrect. Be careful next time.