Stickers are a relatively new feature to Matrix and there are currently two competing implementations (MSC#1951 and MSC#2545), which makes their usage not exactly straight forward.
On this page I'll focus on MSC#2545 Stickers and:
If you are interested in Sticker Packs for Element (MSC#1951) I recommend having a look at Maumium Sticker Picker.
All of the Packs listed below are also part of this Space: #stickers:squirrel.rocks. That way, if you join both the Pack's Rooms and the Space, they will be grouped together and not clutter your room list.
This Pack was created by Kiaun and is licensed CC BY-NC-SA.
Published at: #stickers_derideal:squirrel.rocks | PreviewThis Pack was created by Kiaun and is licensed CC BY-NC-SA.
Published at: #stickers_mix+pixi:squirrel.rocks | PreviewThis pack was created by Heatherhorns and is licensed CC BY-SA.
Published at: #stickers_blobhaj:squirrel.rocks | Preview
The process is essentially as follows:
The exact Names of the menu entries and settings depend on your client, I tried to illustrate it with some screenshots from FluffyChat (left to right, top to bottom, with alt text):