Stylisers are things that make something look better or more special, like decorations or changes to the way something looks.
Stylisers are usually good because they make things look nicer or more interesting.
Examples:
She uses stylisers to make her room look pretty.
The flowers are stylisers for the table.
The stickers are stylisers for my notebook.
The new curtains are great stylisers for the window.
The shiny lights are amazing stylisers for the party.
The colorful paint is a wonderful styliser for the wall.