Please note, this is not spam, my only connection with them is as a customer. It is just favourable customer comment in this chat thread.
Papier does cards, mailing them either to the recipient direct, or to the customer together with an envelope.
www.papier.com/
Basically four types.
Preset picture, or preset picture with preset fixed wording, you add a custom greeting inside, or leave blank.
Preset picture with lettering, you can change the words, colour and font, and add a custom greeting inside, or leave blank.
Preset template to which you add an image or images that you upload (how many being dependent upon the template) add a custom greeting inside, or leave blank.
Produce a card entirely using an image of your own and wording of your own with none of their preset content (except for an imprint on the back of the card)
They name the ones where you supply an image or images as photo cards, but as one is not actually uploading a photograph but a jpg file containing the image of a photograph, it is possible to use a jpg image file that is not a photograph that one has generated on a computer.
I have used both the second one in the list above and the fourth one.
I have used the facility both to send Christmas cards direct, Birthday cards direct, and to send custom cards of my own computer artwork to myself and framed them using frames from Tesco delivered with the grocery.
Papier has an online chat facility to advise.
I have found the quality of the printing to be excellent.
What I particularly like about Papier is that the cards are matt finish and on quite thick quality card. They are sent from Guernsey.
Some of the cards are seven inches by five inches, portrait or landscape orientation, some are square.
For what are termed the photo cards, the pictures shown are just illustrations to show an example, you don't get that picture.
Some of the other websites do a glossy finish.
Some have options for large cards.
It is a matter of what you prefer.