size? half round corners? where it plays an important role. thx for info.

I updated the project - rounded corners 2.5 inch by 3.5 inch

I feel that is very important to know what is the theme of the game. I feel that matching the back side with the game theme is very important and could be very unique. Additional items can be designed not just some "arabesque" lines and knots... which are very used on such designs. Is it a normal card games or a different one?. I am looking forward your reply. Thank you, Vlad

It is a normal playing card game. Nothing to fancy.