I use a number of platforms to self publish stationery, soft furnishing & fashion items for my own fun. No clients work appears on these.
Thortful is a great UK platform for cards. Printed and posted the same day with your special message included. All cards come in A5 & A4 format, and there is a choice of gifts to send with them.
Redbubble transfers any design to any type of finish. Great for tees, laptops, mugs, shower curtains. Delivery worldwide.