Lubuntu is best known as a lightweight and speedy Linux distro, but when it comes to beauty and elegant, it is still lacking. Its default theme is rather plain and boring and its library of themes is limited too. Luckily, there are tons of beautiful themes out there that you can use and you can easily theme it up to make it the best looking distro out there. Here’s how:
Change of theme
Open your file manager, in your Home folder, create a .themes folder. The folder will become hidden after it is created. You will have to press “Ctrl + H” to display hidden files.
Go to gnome-look.org to search for gtk2.0 themes or box-look.org to search for Openbox themes.
rest here