Here is a selection of cards, taken from previous posts, that would be suitable for Mother's Day cards.
Explosion Box with Floating Butterflies

Window Box Pop Up Card

Sliceform Flower Paperweight

Pleated Center Flower Garden Card

Rotating Butterfly Pop Up Card
Hawaiian Quilt Block Cards

Pop Up Photo Album Card

Bouquet Fan Card

Extreme Cards and Papercrafting: pop up cards, movable and mechanical cards, digital crafts and unusual papercrafts.
Explosion Box with Floating Butterflies

Window Box Pop Up Card

Sliceform Flower Paperweight

Pleated Center Flower Garden Card
Rotating Butterfly Pop Up Card
Hawaiian Quilt Block Cards

Pop Up Photo Album Card

Bouquet Fan Card

Extreme Cards and Papercrafting: pop up cards, movable and mechanical cards, digital crafts and unusual papercrafts.