Thanks for contacting us! Yes, you can add your own stickers and clip art. To do this, simply upload your sticker or clip art to the Photo Basket at the bottom of the editor. You can then drag it onto your image and use it as you would a regular sticker. If you upload transparent images, they will maintain their transparency when dragged on.
Let us know if you have any further questions at all. Thanks!
Thanks K! This is a great suggestion, however currently you are only able to select from the existing Sticker groups for Shape Collages. I’ve added this idea to our wishlist for a future Ribbet version. Let us know if you have any other questions!