Once you have found the mini poster that you would like to make a card with (hard to choose! There are over 200), you can choose to have a card made with it. The reason it is a convertible card is that your recipient can take off the mini poster and use it in a 3 1/2x5 frame or they can keep the colored mat on it and use it in a 4x6 frame or keep the whole card together and use it in a 5x7 frame. You can also choose the color for the background (COLOR LISTED IS WITH POLKA DOTS),or if you choose not to, I will pick a color that coordinates with the mini poster. The card comes with an envelope. The card is blank, just waiting for your personal message. I will send you a picture of the finished product for approval if you choose it.