Why not just some shpongle stickers?
Like maybe a transparent film sticker with the shpongle face mask and logo.
They have already done stickers like that, there’s one on the lid of my laptop. Not very big though, 7cm x 8cm, but it is clear backed with the mask and logo.
I got a sheet from Twisted when I ordered Nothing Lasts through Amazon.co.uk, it wasn’t very long ago so they might still have some.