Ever since WhatsApp announced the incorporation of stickers to its instant messaging app, applications to create those stickers started popping up all over the place and now there are hundreds of them.
You can now create stickers for WhatsApp
One of them is this Create Stickers for WhatsApp - WAStickerApps that works very similarly to the rest of the applications. In other words, making use of the images contained in our gallery, we can create our own pack of stickers, provided that there are at least three in each one of them. Whilst adding the images, we can use tools to adjust them being able to remove backgrounds to adapt them to sticker formats to the max.
We can add as many stickers packs for WhatsApp as we want. Then, after adding them, we simply have to resort to the same search tool that we use to add other stickers to our chats.