Here are a lot of upright z-fold cards, but also some "regular" z- or s-folded cards. They sure are fun to make they can be varied in their layout :).
by 折り紙の時間 / Origami Time
by Arthur 3D origami
by WOW NOLA Creations
by Henry Phạm - Origami Tutorials
by Renu's Craft World
by Candy Craig
by Sangita's Creation