You can download the original Tweaker asset files by clicking here.
You can then recolor the original theme's assets (using a service like LunaPic or GIMP's Colorize function), or modify them however else you wish, and load them into the Tweaker through the Tweaker settings -> Theme settings menu.
These are ready-to-use PSO2 Tweaker themes created by the people who work on the Tweaker. Click on them to have the Tweaker install them. If you have a cool theme you'd like to see here, send me a DM on Discord (Aida Enna#0001).
These are ready-to-use PSO2 Tweaker themes created by users of the Tweaker. Click on them to download them, optionally install any font files in the zips (if they are any), then click "Import theme" in the Tweaker and select the zip file. If you have a cool theme you'd like to see here, send me a DM on Discord (Aida Enna#0001).