boot - Problem updating plymouth bootscreen theme

I've made a new theme based on ("/usr/share/plymouth/themes/ubuntu-logo").

Simply changed all the purple into blue. I've updated the .plymouth (bluebuntu.plymouth) file and script:

ImageDir=/usr/share/plymouth/themes/bluebuntu

ScriptFile=/usr/share/plymouth/themes/bluebuntu/bluebuntu.script

Then I ran:

sudo update-alternatives --install /usr/share/plymouth/themes/default.plymouth default.plymouth /usr/share/plymouth/themes/bluebuntu/bluebuntu.plymouth 100
sudo update-alternatives --config default.plymouth

(Selected my new theme: /usr/share/plymouth/themes/bluebuntu/bluebuntu.plymouth)

Then ran:

sudo update-initramfs -u

The problem is the bootscreen is still showing the purple version...

I even tried changing the names of all the .png files in case it's caching it based on name or something, but it doesn't work.

Is there something I'm missing?