Here's a round up of some of my favourites.
I think this is lovely. I'd allow them to print different colour squares on a page rather than gluing tissue paper the first week back! Then just have them draw themselves on white paper, cut it and stick it on (you might want to do that bit 😁)
I'd use a variety of colours for the backing paper. I like the photo and their drawing on the one page.
I've created some first day worksheets for you too.