There are a few things you can do to make your taskbar more aesthetic:
1. Choose a color or image for your taskbar that compliments the rest of your desktop.
2. Organize your taskbar icons into groups so that related items are next to each other.
3. Uninstall any unnecessary programs or icons from your taskbar to declutter it.
4. Use a taskbar customization program like Taskbar Eliminator to further customize the look of your taskbar.