The cards are all pretty much the same, using a bit of simple mat and layering and faux stitching and dots using a black fine liner pen.
The 3D printed, felt rabbits were 50p for a pack of four from Hobbycraft (I think I may have got them in a sale), I think I have also seen something very similar in Home Bargains for around the same price.
The 3D card sentiments are part of an assorted pack of nine by Express Yourself MIP, I think also from Hobbycraft. I reckon they took me less than 15 minutes each to make.