This is one of my favourite card folds as it is simple to create but makes your card a bit different. I've also found that when selling cards, this style is really popular as people have not seen it before and they are great to display.
An easel card looks like this when displayed
To create this style of card you start by folding the A4 card down the centre and then again down the A4 gatefold line (fold the front half in half again). The bottom front of the card has something added to act as a stopper for the top easel part. You can use a strip of card, gems, card candi or anything alse that can be raised with 3d foam. I like to use a whole piece of decorative paper raised up on the 3d foam.
The easel section displays your toppers and they can go above the height of the easel section- it is best to lay the easel section down as you attach the toppers so that they do not go above the entire height of the card (it will not fit in the envelope). Just remember to only put the double sided tape/3d foam on the bottom part of the toppers.