Allow us to customize it a little bit more maybe, examples I have in my head are such as:

• Custom Background for Home and other sub-pages (option to make it blurry as well would be nice)

• Particles on the whole site as well, well just as a decoration. You could enable any particles you'd like such as snowflakes, maybe something easter planned etc. As I said, make it so people can enable/disable it anytime, since some may find that annoying - or just let anyone on site enable or disable it whenever they want as a Client-Side.

• Session Tabs Customization - basically, similar to first point - you could do an image instead of default session color, or do a gradient color etc.

I mean, it's not that necessary, but I think could be used by some people. If you have more ideas or disagree with some, comment below.